tests/testthat/test_1_origami.R
In osofr/stremr: Streamlined Estimation for Static, Dynamic and Stochastic Treatment Regimes in Longitudinal Data
context("origami Super Learner")
reqxgb <- requireNamespace("xgboost", quietly = TRUE)
reqh2o <- requireNamespace("h2o", quietly = TRUE)
if (!reqxgb || !reqh2o) return(TRUE)
## -----------------------------------------------------------------------
## Analyses by intervention
## **** makes it easier to read the individual analyses ****
## -----------------------------------------------------------------------
`%+%` <- function(a, b) paste0(a, b)
library("stremr")
library("data.table")
library("magrittr")
library("ggplot2")
library("tibble")
library("tidyr")
library("purrr")
library("dplyr")
library("sl3")
options(stremr.verbose = FALSE)
options(gridisl.verbose = FALSE)
options(sl3.verbose = FALSE)
options(condensier.verbose = FALSE)
# options(stremr.verbose = TRUE)
# options(gridisl.verbose = TRUE)
# options(sl3.verbose = TRUE)
# options(condensier.verbose = TRUE)
data.table::setDTthreads(1)
data(OdatDT_10K)
Odat_DT <- OdatDT_10K
# select only the first 100 IDs
Odat_DT <- Odat_DT[ID %in% (1:100), ]
setkeyv(Odat_DT, cols = c("ID", "t"))
## -----------------------------------------------------------------------
## Define some summaries (lags C[t-1], A[t-1], N[t-1])
## -----------------------------------------------------------------------
ID <- "ID"; t <- "t"; TRT <- "TI"; I <- "highA1c"; outcome <- "Y.tplus1";
lagnodes <- c("C", "TI", "N")
newVarnames <- lagnodes %+% ".tminus1"
Odat_DT[, (newVarnames) := shift(.SD, n=1L, fill=0L, type="lag"), by=ID, .SDcols=(lagnodes)]
# indicator that the person has never been on treatment up to current t
Odat_DT[, ("barTIm1eq0") := as.integer(c(0, cumsum(get(TRT))[-.N]) %in% 0), by = eval(ID)]
Odat_DT[, ("lastNat1.factor") := as.factor(lastNat1)]
## ------------------------------------------------------------------
## Propensity score models for Treatment, Censoring & Monitoring
## ------------------------------------------------------------------
gform_TRT <- "TI ~ CVD + highA1c + N.tminus1"
stratify_TRT <- list(
TI=c("t == 0L", # MODEL TI AT t=0
"(t > 0L) & (N.tminus1 == 1L) & (barTIm1eq0 == 1L)", # MODEL TRT INITATION WHEN MONITORED
"(t > 0L) & (N.tminus1 == 0L) & (barTIm1eq0 == 1L)", # MODEL TRT INITATION WHEN NOT MONITORED
"(t > 0L) & (barTIm1eq0 == 0L)" # MODEL TRT CONTINUATION (BOTH MONITORED AND NOT MONITORED)
))
gform_CENS <- c("C ~ highA1c + t")
gform_MONITOR <- "N ~ 1"
## ------------------------------------------------------------
## **** As a first step define a grid of all possible parameter combinations (for all estimators)
## **** This dataset is to be saved and will be later merged in with all analysis
## ------------------------------------------------------------
trunc_IPW <- 10
# tvals <- 0:6
tvals <- 0:2
tmax <- 13
## number of folds for CV:
# nfolds <- 6
nfolds <- 4
tbreaks = c(1:8,11,14)-1
## This dataset defines all parameters that we like to vary in this analysis (including different interventions)
## That is, each row of this dataset corresponds with a single analysis, for one intervention of interest.
analysis <- list(intervened_TRT = c("gTI.dlow", "gTI.dhigh"),
trunc_wt = c(FALSE, TRUE),
stratifyQ_by_rule = c(TRUE, FALSE)) %>%
cross_df() %>%
arrange(stratifyQ_by_rule) %>%
mutate(nfolds = as.integer(nfolds)) %>%
mutate(trunc_MSM = map_dbl(trunc_wt, ~ ifelse(.x, trunc_IPW, Inf))) %>%
mutate(trunc_TMLE = trunc_MSM*10)
## ----------------------------------------------------------------
## IMPORT DATA
## ----------------------------------------------------------------
# library("h2o")
# h2o::h2o.init(nthreads = 2)
OData <- stremr::importData(Odat_DT, ID = "ID", t = "t", covars = c("highA1c", "lastNat1", "lastNat1.factor"), CENS = "C", TRT = "TI", MONITOR = "N", OUTCOME = outcome)
OData <- define_CVfolds(OData, nfolds = nfolds, fold_column = "fold_ID", seed = 12345)
OData$dat.sVar[]
OData$fold_column <- NULL
OData$nfolds <- NULL
fold_column <- "fold_ID"
## ----------------------------------------------------------------
## Define ensemble of models for fitting propensity scores (g).
## ----------------------------------------------------------------
## This example uses a discrete SuperLearner: best model will be selected on the basis of CV-MSE.
## Use cross-validation to select best model for g (set 'fit_method_g <- "none"' to just fit a single model w/out CV)
# fit_method_g <- "origamiSL"
fit_method_g <- "cv"
# fit_method_g <- "none"
## Note that 'interactions' CANNOT be used with h2o (for now).
## The only learners that allow interactions are: "glm" ,"speedglm", "xgboost".
models_g <-
# defModel(estimator = "h2o__glm", family = "binomial",
# # lambda_search = FALSE,
# # nlambdas = 5,
# param_grid = list(
# alpha = 0
# # alpha = c(0.5)
# ))
# defModel(estimator = "xgboost__glm", family = "binomial", nthread = 1) +
# defModel(estimator = "speedglm__glm", family = "quasibinomial") +
# defModel(estimator = "xgboost__gbm", family = "quasibinomial", nrounds = 20)
Lrnr_sl$new(learners = Stack$new(
Lrnr_xgboost$new(nthread = 1, nrounds = 20),
Lrnr_glm_fast$new()
),
metalearner = Lrnr_solnp$new()
)
## ------------------------------------------------------------------------
## Define models for iterative G-COMP (Q) -- PARAMETRIC LOGISTIC REGRESSION
## ------------------------------------------------------------------------
## regression formulas for Q's:
Qforms <- rep.int("Qkplus1 ~ CVD + highA1c + N + lastNat1 + TI + TI.tminus1", (max(tvals)+1))
## no cross-validation model selection, just fit a single model specified below
# fit_method_Q <- "origamiSL"
fit_method_Q <- "cv"
## Use speedglm to fit all Q.
## NOTE: it is currently not possible to use fit_method_Q <- "cv" with speedglm or glm.
## To perform cross-validation with GLM use 'estimator="h2o__glm"' or 'estimator="xgboost__glm"'
models_Q <-
Lrnr_sl$new(learners = Stack$new(
Lrnr_xgboost$new(nthread = 1, nrounds = 20),
Lrnr_glm_fast$new()
),
metalearner = Lrnr_solnp$new()
)
## ------------------------------------------------------------------------
## Alternative specifications of Q models for iterative G-COMP (Q) -- NONPARAMETRIC REGRESSION (GBM) + REGULARIZED GLM
## ------------------------------------------------------------------------
# ## This example uses a discrete SuperLearner: best model will be selected on the basis of CV-MSE.
# fit_method_Q <- "cv"
# models_Q <<-
# defModel(estimator = "xgboost__gbm", family = "binomial",
# nrounds = 200,
# early_stopping_rounds = 3,
# interactions = list(c("TI", "highA1c"), c("TI", "CVD"), c("TI", "lastNat1")),
# learning_rate = .1,
# max_depth = 5,
# gamma = .5,
# colsample_bytree = 0.8,
# subsample = 0.8,
# lambda = 2,
# alpha = 0.5,
# max_delta_step = 2) +
# defModel(estimator = "xgboost__glm",
# family = "quasibinomial",
# seed = 23,
# nrounds = 500,
# early_stopping_rounds = 5,
# interactions = list(c("TI", "highA1c"), c("TI", "CVD"), c("TI", "lastNat1")),
# param_grid = list(
# alpha = c(.0, 0.5, 1.0),
# lambda = c(.01, .1, .5, .9, 1.5, 5)
# )
# )
## ----------------------------------------------------------------
## Fit propensity score models.
## We are using the same model ensemble defined in models_g for censoring, treatment and monitoring mechanisms.
## ----------------------------------------------------------------
# test_that("fitting g w/ Super Learner", {
OData <- fitPropensity(OData,
gform_CENS = gform_CENS, gform_TRT = gform_TRT,
stratify_TRT = stratify_TRT,
models_CENS = models_g, models_TRT = models_g,
fit_method = fit_method_g,
fold_column = fold_column)
# })
## ------------------------------------------------------------
## RUN IPW ANALYSES
## **** For each individual analysis do filter()/subset()/etc to create a grid of parameters specific to given estimator
## ------------------------------------------------------------
# test_that("evaluating IPW", {
IPW_time <- system.time({
IPW <- analysis %>%
rename(trunc_weight = trunc_MSM) %>%
distinct(intervened_TRT, trunc_weight) %>%
group_by(intervened_TRT) %>%
mutate(wts_data = map(first(intervened_TRT), getIPWeights, OData = OData, tmax = tmax)) %>%
## save the tables of weights summaries (sep for each regimen)
mutate(wts_tabs = map(wts_data,
~ get_wtsummary(.x, cutoffs = c(0, 0.5, 1, 10, 20, 30, 40, 50, 100, 150), by.rule = TRUE))) %>%
## save the tables with number at risk / following each rule (sep for each regimen)
mutate(FUPtimes_tabs = map(wts_data,
~ get_FUPtimes(.x, IDnode = ID, tnode = t))) %>%
ungroup() %>%
## IPW-Adjusted KM (Non-Parametric or Saturated MSM):
mutate(NPMSM = map2(wts_data, trunc_weight,
~ survNPMSM(wts_data = .x,
trunc_weights = .y,
OData = OData))) %>%
mutate(NPMSM = map(NPMSM, "estimates")) %>%
## Crude MSM for hazard (w/out IPW):
mutate(MSM.crude = map(wts_data,
~ survMSM(wts_data = .x,
OData = OData,
tbreaks = tbreaks,
use_weights = FALSE,
glm_package = "speedglm"))) %>%
mutate(MSM.crude = map(MSM.crude, "estimates")) %>%
## IPW-MSM for hazard (smoothing over time-intervals in tbreaks):
mutate(MSM = map2(wts_data, trunc_weight,
~ survMSM(wts_data = .x,
trunc_weights = .y,
OData = OData,
tbreaks = tbreaks,
glm_package = "speedglm"))) %>%
mutate(MSM = map(MSM, "estimates")) %>%
rename(trunc_MSM = trunc_weight)
})
IPW_time_hrs <- IPW_time[3]/60/60
## save IPW tables (will be later merged with main results dataset)
IPWtabs <- analysis %>%
left_join(IPW) %>%
distinct(intervened_TRT, trunc_MSM, wts_tabs, FUPtimes_tabs) %>%
nest(intervened_TRT, wts_tabs, FUPtimes_tabs, .key = "IPWtabs")
IPW <- IPW %>% select(-wts_data, -wts_tabs, -FUPtimes_tabs)
# })
## ------------------------------------------------------------
## GCOMP ANALYSIS
## ------------------------------------------------------------
# test_that("fitting Q w/ origami Super Learner, with byfold = TRUE", {
GCOMP <-analysis %>%
distinct(intervened_TRT, stratifyQ_by_rule) %>%
mutate(GCOMP = map2(intervened_TRT, stratifyQ_by_rule,
~ fit_GCOMP(intervened_TRT = .x,
stratifyQ_by_rule = .y,
tvals = tvals,
OData = OData,
models = models_Q,
Qforms = Qforms,
fit_method = fit_method_Q,
fold_column = fold_column,
byfold = FALSE))) %>%
mutate(GCOMP = map(GCOMP, "estimates"))
# })
## ------------------------------------------------------------
## TMLE ANALYSIS
## ------------------------------------------------------------
# TMLE <- CVTMLE <- analysis %>%
# rename(trunc_weight = trunc_TMLE) %>%
# distinct(intervened_TRT, stratifyQ_by_rule, trunc_weight)
# TMLE_time <- system.time({
# TMLE <- TMLE %>%
# mutate(TMLE = pmap(TMLE, fit_TMLE,
# tvals = tvals,
# OData = OData,
# models = models_Q,
# Qforms = Qforms,
# fit_method = fit_method_Q,
# fold_column = fold_column)) %>%
# mutate(TMLE = map(TMLE, "estimates")) %>%
# rename(trunc_TMLE = trunc_weight)
# })
# TMLE_time_hrs <- TMLE_time[3]/60/60
# CVTMLE_time <- system.time({
# CVTMLE <- CVTMLE %>%
# mutate(CVTMLE = pmap(CVTMLE, fit_CVTMLE,
# tvals = tvals,
# OData = OData,
# models = models_Q,
# Qforms = Qforms,
# fit_method = fit_method_Q,
# fold_column = fold_column)) %>%
# mutate(CVTMLE = map(CVTMLE, "estimates")) %>%
# rename(trunc_TMLE = trunc_weight)
# })
# CVTMLE_time_hrs <- TMLE_time[3]/60/60
## ------------------------------------------------------------
## COMBINE ALL ANALYSES INTO A SINGLE DATASET
## ------------------------------------------------------------
results <- analysis %>%
left_join(IPW) %>%
left_join(GCOMP)
# left_join(TMLE) %>%
# left_join(CVTMLE)
## Nest each estimator by treatment regimen (we now only show the main analysis rows)
results <- results %>%
nest(intervened_TRT, NPMSM, MSM.crude, MSM, GCOMP, .key = "estimates")
# nest(intervened_TRT, NPMSM, MSM.crude, MSM, GCOMP, TMLE, CVTMLE, .key = "estimates")
## Calculate RDs (contrasting all interventions, for each analysis row & estimator).
## The RDs data no longer needs the intervened_TRT column
results <- results %>%
mutate(RDs =
map(estimates,
~ select(.x, -intervened_TRT) %>%
map(~ get_RDs(.x)) %>%
as_tibble()
))
## ------------------------------------------------------------
## Uncomment and run this to remove the individual EIC estimates from MSM and TMLE estimates.
## This is useful if saving results to a file. The EIC take up a lot of space, hence removing them
## will significantly reduce the final file size.
## ------------------------------------------------------------
## Clean up by removing the subject-level IC estimates for EVERY SINGLE ESTIMATE / ANALYSIS
## WARNING: THIS IS A SIDE-EFFECT FUNCTION!
# res <- results[["estimates"]] %>%
# map(
# ~ select(.x, -intervened_TRT) %>%
# map(
# ~ map(.x,
# ~ suppressWarnings(.x[, ("IC.St") := NULL]))))
# rm(res)
## ------------------------------------------------------------
## Add models used for g and Q. Create the final analysis file.
## Add IPWtabs
## ------------------------------------------------------------
# results <- results %>%
# left_join(IPWtabs) %>%
# mutate(fit_method_g = fit_method_g) %>%
# mutate(fit_method_Q = fit_method_Q) %>%
# mutate(models_g = map(fit_method_g, ~ models_g)) %>%
# mutate(models_Q = map(fit_method_Q, ~ models_Q)) %>%
# mutate(run_time = map(trunc_wt,
# ~ tibble(IPW_time_hrs = IPW_time_hrs, GCOMP_time_hrs = GCOMP_time_hrs, TMLE_time_hrs = TMLE_time_hrs)))
## ------------------------------------------------------------
## VARIOUS WAYS OF PLOTTING SURVIVAL CURVES
## ------------------------------------------------------------
ests <- "GCOMP"
SURVplot <- results[1, ][["estimates"]][[1]][[ests]] %>%
ggsurv %>%
print
# results[["estimates"]]
# GCOMP <-GCOMP %>%
# mutate(plotGCOMP = map(GCOMP, ~ ggsurv(estimates = .x))) %>%
## FLATTEN THE results data (long format)
## then add a new column with ggplot survival plot objects for THESE 3 estimators;
# ests <- c("MSM", "GCOMP", "TMLE")
# longSURV <- results %>%
# select(trunc_wt, stratifyQ_by_rule, trunc_MSM, trunc_TMLE, estimates) %>%
# unnest(estimates) %>%
# gather(key = est, value = estimates, NPMSM, MSM.crude, MSM, GCOMP, TMLE, CVTMLE) %>%
# filter(est %in% ests) %>%
# select(-intervened_TRT) %>%
# nest(estimates, .key = "estimates") %>%
# mutate(SURVplot = map(estimates, ~ ggsurv(.x)))
## Visualize all survival curves at once with a single interactive trelliscope panel
## (install via: devtools::install_github("hafen/trelliscopejs"))
# reqtrell <- requireNamespace("trelliscopejs", quietly = TRUE)
# if (reqtrell && FALSE) {
# longSURV %>%
# trelliscopejs::trelliscope(name = "test", panel_col = "SURVplot")
# longSURV
# }
## ------------------------------------------------------------
## VARIOUS WAYS OF PLOTTING RD TABLEs
## ------------------------------------------------------------
## THE TABLE OF RDs FOR TMLE:
# results %>% filter(trunc_wt == TRUE, stratifyQ_by_rule == TRUE) %>% select(RDs) %>% unnest(RDs) %>% select(TMLE) %>% unnest(TMLE)
# ## PLOT RD FOR TMLE FOR SPECIFIC SCENARIO:
# ests <- "TMLE"
# RDplot <- results[["RDs"]][[1]][[ests]][[1]] %>%
# ggRD(t_int_sel = 1:5) %>%
# print
# ## GENERERATE RD PLOTS across all scenarios for these two estimators:
# ests <- c("MSM", "TMLE")
# longRDs <- results %>%
# select(trunc_wt, stratifyQ_by_rule, trunc_MSM, trunc_TMLE, RDs) %>%
# unnest(RDs) %>%
# gather(key = est, value = RDs, NPMSM, MSM.crude, MSM, GCOMP, TMLE, CVTMLE) %>%
# filter(est %in% ests) %>%
# mutate(RDplot = map(RDs, ~ ggRD(.x)))
# reqtrell <- requireNamespace("trelliscopejs", quietly = TRUE)
# if (reqtrell && FALSE) {
# longRDs %>%
# trelliscopejs::trelliscope(name = "test", panel_col = "RDplot")
# longRDs
# }
# h2o::h2o.shutdown(prompt = FALSE)
# }
osofr/stremr documentation built on Jan. 25, 2022, 8:07 a.m.
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context("origami Super Learner")
reqxgb <- requireNamespace("xgboost", quietly = TRUE)
reqh2o <- requireNamespace("h2o", quietly = TRUE)
if (!reqxgb || !reqh2o) return(TRUE)
## -----------------------------------------------------------------------
## Analyses by intervention
## **** makes it easier to read the individual analyses ****
## -----------------------------------------------------------------------
`%+%` <- function(a, b) paste0(a, b)
library("stremr")
library("data.table")
library("magrittr")
library("ggplot2")
library("tibble")
library("tidyr")
library("purrr")
library("dplyr")
library("sl3")
options(stremr.verbose = FALSE)
options(gridisl.verbose = FALSE)
options(sl3.verbose = FALSE)
options(condensier.verbose = FALSE)
# options(stremr.verbose = TRUE)
# options(gridisl.verbose = TRUE)
# options(sl3.verbose = TRUE)
# options(condensier.verbose = TRUE)
data.table::setDTthreads(1)
data(OdatDT_10K)
Odat_DT <- OdatDT_10K
# select only the first 100 IDs
Odat_DT <- Odat_DT[ID %in% (1:100), ]
setkeyv(Odat_DT, cols = c("ID", "t"))
## -----------------------------------------------------------------------
## Define some summaries (lags C[t-1], A[t-1], N[t-1])
## -----------------------------------------------------------------------
ID <- "ID"; t <- "t"; TRT <- "TI"; I <- "highA1c"; outcome <- "Y.tplus1";
lagnodes <- c("C", "TI", "N")
newVarnames <- lagnodes %+% ".tminus1"
Odat_DT[, (newVarnames) := shift(.SD, n=1L, fill=0L, type="lag"), by=ID, .SDcols=(lagnodes)]
# indicator that the person has never been on treatment up to current t
Odat_DT[, ("barTIm1eq0") := as.integer(c(0, cumsum(get(TRT))[-.N]) %in% 0), by = eval(ID)]
Odat_DT[, ("lastNat1.factor") := as.factor(lastNat1)]
## ------------------------------------------------------------------
## Propensity score models for Treatment, Censoring & Monitoring
## ------------------------------------------------------------------
gform_TRT <- "TI ~ CVD + highA1c + N.tminus1"
stratify_TRT <- list(
TI=c("t == 0L", # MODEL TI AT t=0
"(t > 0L) & (N.tminus1 == 1L) & (barTIm1eq0 == 1L)", # MODEL TRT INITATION WHEN MONITORED
"(t > 0L) & (N.tminus1 == 0L) & (barTIm1eq0 == 1L)", # MODEL TRT INITATION WHEN NOT MONITORED
"(t > 0L) & (barTIm1eq0 == 0L)" # MODEL TRT CONTINUATION (BOTH MONITORED AND NOT MONITORED)
))
gform_CENS <- c("C ~ highA1c + t")
gform_MONITOR <- "N ~ 1"
## ------------------------------------------------------------
## **** As a first step define a grid of all possible parameter combinations (for all estimators)
## **** This dataset is to be saved and will be later merged in with all analysis
## ------------------------------------------------------------
trunc_IPW <- 10
# tvals <- 0:6
tvals <- 0:2
tmax <- 13
## number of folds for CV:
# nfolds <- 6
nfolds <- 4
tbreaks = c(1:8,11,14)-1
## This dataset defines all parameters that we like to vary in this analysis (including different interventions)
## That is, each row of this dataset corresponds with a single analysis, for one intervention of interest.
analysis <- list(intervened_TRT = c("gTI.dlow", "gTI.dhigh"),
trunc_wt = c(FALSE, TRUE),
stratifyQ_by_rule = c(TRUE, FALSE)) %>%
cross_df() %>%
arrange(stratifyQ_by_rule) %>%
mutate(nfolds = as.integer(nfolds)) %>%
mutate(trunc_MSM = map_dbl(trunc_wt, ~ ifelse(.x, trunc_IPW, Inf))) %>%
mutate(trunc_TMLE = trunc_MSM*10)
## ----------------------------------------------------------------
## IMPORT DATA
## ----------------------------------------------------------------
# library("h2o")
# h2o::h2o.init(nthreads = 2)
OData <- stremr::importData(Odat_DT, ID = "ID", t = "t", covars = c("highA1c", "lastNat1", "lastNat1.factor"), CENS = "C", TRT = "TI", MONITOR = "N", OUTCOME = outcome)
OData <- define_CVfolds(OData, nfolds = nfolds, fold_column = "fold_ID", seed = 12345)
OData$dat.sVar[]
OData$fold_column <- NULL
OData$nfolds <- NULL
fold_column <- "fold_ID"
## ----------------------------------------------------------------
## Define ensemble of models for fitting propensity scores (g).
## ----------------------------------------------------------------
## This example uses a discrete SuperLearner: best model will be selected on the basis of CV-MSE.
## Use cross-validation to select best model for g (set 'fit_method_g <- "none"' to just fit a single model w/out CV)
# fit_method_g <- "origamiSL"
fit_method_g <- "cv"
# fit_method_g <- "none"
## Note that 'interactions' CANNOT be used with h2o (for now).
## The only learners that allow interactions are: "glm" ,"speedglm", "xgboost".
models_g <-
# defModel(estimator = "h2o__glm", family = "binomial",
# # lambda_search = FALSE,
# # nlambdas = 5,
# param_grid = list(
# alpha = 0
# # alpha = c(0.5)
# ))
# defModel(estimator = "xgboost__glm", family = "binomial", nthread = 1) +
# defModel(estimator = "speedglm__glm", family = "quasibinomial") +
# defModel(estimator = "xgboost__gbm", family = "quasibinomial", nrounds = 20)
Lrnr_sl$new(learners = Stack$new(
Lrnr_xgboost$new(nthread = 1, nrounds = 20),
Lrnr_glm_fast$new()
),
metalearner = Lrnr_solnp$new()
)
## ------------------------------------------------------------------------
## Define models for iterative G-COMP (Q) -- PARAMETRIC LOGISTIC REGRESSION
## ------------------------------------------------------------------------
## regression formulas for Q's:
Qforms <- rep.int("Qkplus1 ~ CVD + highA1c + N + lastNat1 + TI + TI.tminus1", (max(tvals)+1))
## no cross-validation model selection, just fit a single model specified below
# fit_method_Q <- "origamiSL"
fit_method_Q <- "cv"
## Use speedglm to fit all Q.
## NOTE: it is currently not possible to use fit_method_Q <- "cv" with speedglm or glm.
## To perform cross-validation with GLM use 'estimator="h2o__glm"' or 'estimator="xgboost__glm"'
models_Q <-
Lrnr_sl$new(learners = Stack$new(
Lrnr_xgboost$new(nthread = 1, nrounds = 20),
Lrnr_glm_fast$new()
),
metalearner = Lrnr_solnp$new()
)
## ------------------------------------------------------------------------
## Alternative specifications of Q models for iterative G-COMP (Q) -- NONPARAMETRIC REGRESSION (GBM) + REGULARIZED GLM
## ------------------------------------------------------------------------
# ## This example uses a discrete SuperLearner: best model will be selected on the basis of CV-MSE.
# fit_method_Q <- "cv"
# models_Q <<-
# defModel(estimator = "xgboost__gbm", family = "binomial",
# nrounds = 200,
# early_stopping_rounds = 3,
# interactions = list(c("TI", "highA1c"), c("TI", "CVD"), c("TI", "lastNat1")),
# learning_rate = .1,
# max_depth = 5,
# gamma = .5,
# colsample_bytree = 0.8,
# subsample = 0.8,
# lambda = 2,
# alpha = 0.5,
# max_delta_step = 2) +
# defModel(estimator = "xgboost__glm",
# family = "quasibinomial",
# seed = 23,
# nrounds = 500,
# early_stopping_rounds = 5,
# interactions = list(c("TI", "highA1c"), c("TI", "CVD"), c("TI", "lastNat1")),
# param_grid = list(
# alpha = c(.0, 0.5, 1.0),
# lambda = c(.01, .1, .5, .9, 1.5, 5)
# )
# )
## ----------------------------------------------------------------
## Fit propensity score models.
## We are using the same model ensemble defined in models_g for censoring, treatment and monitoring mechanisms.
## ----------------------------------------------------------------
# test_that("fitting g w/ Super Learner", {
OData <- fitPropensity(OData,
gform_CENS = gform_CENS, gform_TRT = gform_TRT,
stratify_TRT = stratify_TRT,
models_CENS = models_g, models_TRT = models_g,
fit_method = fit_method_g,
fold_column = fold_column)
# })
## ------------------------------------------------------------
## RUN IPW ANALYSES
## **** For each individual analysis do filter()/subset()/etc to create a grid of parameters specific to given estimator
## ------------------------------------------------------------
# test_that("evaluating IPW", {
IPW_time <- system.time({
IPW <- analysis %>%
rename(trunc_weight = trunc_MSM) %>%
distinct(intervened_TRT, trunc_weight) %>%
group_by(intervened_TRT) %>%
mutate(wts_data = map(first(intervened_TRT), getIPWeights, OData = OData, tmax = tmax)) %>%
## save the tables of weights summaries (sep for each regimen)
mutate(wts_tabs = map(wts_data,
~ get_wtsummary(.x, cutoffs = c(0, 0.5, 1, 10, 20, 30, 40, 50, 100, 150), by.rule = TRUE))) %>%
## save the tables with number at risk / following each rule (sep for each regimen)
mutate(FUPtimes_tabs = map(wts_data,
~ get_FUPtimes(.x, IDnode = ID, tnode = t))) %>%
ungroup() %>%
## IPW-Adjusted KM (Non-Parametric or Saturated MSM):
mutate(NPMSM = map2(wts_data, trunc_weight,
~ survNPMSM(wts_data = .x,
trunc_weights = .y,
OData = OData))) %>%
mutate(NPMSM = map(NPMSM, "estimates")) %>%
## Crude MSM for hazard (w/out IPW):
mutate(MSM.crude = map(wts_data,
~ survMSM(wts_data = .x,
OData = OData,
tbreaks = tbreaks,
use_weights = FALSE,
glm_package = "speedglm"))) %>%
mutate(MSM.crude = map(MSM.crude, "estimates")) %>%
## IPW-MSM for hazard (smoothing over time-intervals in tbreaks):
mutate(MSM = map2(wts_data, trunc_weight,
~ survMSM(wts_data = .x,
trunc_weights = .y,
OData = OData,
tbreaks = tbreaks,
glm_package = "speedglm"))) %>%
mutate(MSM = map(MSM, "estimates")) %>%
rename(trunc_MSM = trunc_weight)
})
IPW_time_hrs <- IPW_time[3]/60/60
## save IPW tables (will be later merged with main results dataset)
IPWtabs <- analysis %>%
left_join(IPW) %>%
distinct(intervened_TRT, trunc_MSM, wts_tabs, FUPtimes_tabs) %>%
nest(intervened_TRT, wts_tabs, FUPtimes_tabs, .key = "IPWtabs")
IPW <- IPW %>% select(-wts_data, -wts_tabs, -FUPtimes_tabs)
# })
## ------------------------------------------------------------
## GCOMP ANALYSIS
## ------------------------------------------------------------
# test_that("fitting Q w/ origami Super Learner, with byfold = TRUE", {
GCOMP <-analysis %>%
distinct(intervened_TRT, stratifyQ_by_rule) %>%
mutate(GCOMP = map2(intervened_TRT, stratifyQ_by_rule,
~ fit_GCOMP(intervened_TRT = .x,
stratifyQ_by_rule = .y,
tvals = tvals,
OData = OData,
models = models_Q,
Qforms = Qforms,
fit_method = fit_method_Q,
fold_column = fold_column,
byfold = FALSE))) %>%
mutate(GCOMP = map(GCOMP, "estimates"))
# })
## ------------------------------------------------------------
## TMLE ANALYSIS
## ------------------------------------------------------------
# TMLE <- CVTMLE <- analysis %>%
# rename(trunc_weight = trunc_TMLE) %>%
# distinct(intervened_TRT, stratifyQ_by_rule, trunc_weight)
# TMLE_time <- system.time({
# TMLE <- TMLE %>%
# mutate(TMLE = pmap(TMLE, fit_TMLE,
# tvals = tvals,
# OData = OData,
# models = models_Q,
# Qforms = Qforms,
# fit_method = fit_method_Q,
# fold_column = fold_column)) %>%
# mutate(TMLE = map(TMLE, "estimates")) %>%
# rename(trunc_TMLE = trunc_weight)
# })
# TMLE_time_hrs <- TMLE_time[3]/60/60
# CVTMLE_time <- system.time({
# CVTMLE <- CVTMLE %>%
# mutate(CVTMLE = pmap(CVTMLE, fit_CVTMLE,
# tvals = tvals,
# OData = OData,
# models = models_Q,
# Qforms = Qforms,
# fit_method = fit_method_Q,
# fold_column = fold_column)) %>%
# mutate(CVTMLE = map(CVTMLE, "estimates")) %>%
# rename(trunc_TMLE = trunc_weight)
# })
# CVTMLE_time_hrs <- TMLE_time[3]/60/60
## ------------------------------------------------------------
## COMBINE ALL ANALYSES INTO A SINGLE DATASET
## ------------------------------------------------------------
results <- analysis %>%
left_join(IPW) %>%
left_join(GCOMP)
# left_join(TMLE) %>%
# left_join(CVTMLE)
## Nest each estimator by treatment regimen (we now only show the main analysis rows)
results <- results %>%
nest(intervened_TRT, NPMSM, MSM.crude, MSM, GCOMP, .key = "estimates")
# nest(intervened_TRT, NPMSM, MSM.crude, MSM, GCOMP, TMLE, CVTMLE, .key = "estimates")
## Calculate RDs (contrasting all interventions, for each analysis row & estimator).
## The RDs data no longer needs the intervened_TRT column
results <- results %>%
mutate(RDs =
map(estimates,
~ select(.x, -intervened_TRT) %>%
map(~ get_RDs(.x)) %>%
as_tibble()
))
## ------------------------------------------------------------
## Uncomment and run this to remove the individual EIC estimates from MSM and TMLE estimates.
## This is useful if saving results to a file. The EIC take up a lot of space, hence removing them
## will significantly reduce the final file size.
## ------------------------------------------------------------
## Clean up by removing the subject-level IC estimates for EVERY SINGLE ESTIMATE / ANALYSIS
## WARNING: THIS IS A SIDE-EFFECT FUNCTION!
# res <- results[["estimates"]] %>%
# map(
# ~ select(.x, -intervened_TRT) %>%
# map(
# ~ map(.x,
# ~ suppressWarnings(.x[, ("IC.St") := NULL]))))
# rm(res)
## ------------------------------------------------------------
## Add models used for g and Q. Create the final analysis file.
## Add IPWtabs
## ------------------------------------------------------------
# results <- results %>%
# left_join(IPWtabs) %>%
# mutate(fit_method_g = fit_method_g) %>%
# mutate(fit_method_Q = fit_method_Q) %>%
# mutate(models_g = map(fit_method_g, ~ models_g)) %>%
# mutate(models_Q = map(fit_method_Q, ~ models_Q)) %>%
# mutate(run_time = map(trunc_wt,
# ~ tibble(IPW_time_hrs = IPW_time_hrs, GCOMP_time_hrs = GCOMP_time_hrs, TMLE_time_hrs = TMLE_time_hrs)))
## ------------------------------------------------------------
## VARIOUS WAYS OF PLOTTING SURVIVAL CURVES
## ------------------------------------------------------------
ests <- "GCOMP"
SURVplot <- results[1, ][["estimates"]][[1]][[ests]] %>%
ggsurv %>%
print
# results[["estimates"]]
# GCOMP <-GCOMP %>%
# mutate(plotGCOMP = map(GCOMP, ~ ggsurv(estimates = .x))) %>%
## FLATTEN THE results data (long format)
## then add a new column with ggplot survival plot objects for THESE 3 estimators;
# ests <- c("MSM", "GCOMP", "TMLE")
# longSURV <- results %>%
# select(trunc_wt, stratifyQ_by_rule, trunc_MSM, trunc_TMLE, estimates) %>%
# unnest(estimates) %>%
# gather(key = est, value = estimates, NPMSM, MSM.crude, MSM, GCOMP, TMLE, CVTMLE) %>%
# filter(est %in% ests) %>%
# select(-intervened_TRT) %>%
# nest(estimates, .key = "estimates") %>%
# mutate(SURVplot = map(estimates, ~ ggsurv(.x)))
## Visualize all survival curves at once with a single interactive trelliscope panel
## (install via: devtools::install_github("hafen/trelliscopejs"))
# reqtrell <- requireNamespace("trelliscopejs", quietly = TRUE)
# if (reqtrell && FALSE) {
# longSURV %>%
# trelliscopejs::trelliscope(name = "test", panel_col = "SURVplot")
# longSURV
# }
## ------------------------------------------------------------
## VARIOUS WAYS OF PLOTTING RD TABLEs
## ------------------------------------------------------------
## THE TABLE OF RDs FOR TMLE:
# results %>% filter(trunc_wt == TRUE, stratifyQ_by_rule == TRUE) %>% select(RDs) %>% unnest(RDs) %>% select(TMLE) %>% unnest(TMLE)
# ## PLOT RD FOR TMLE FOR SPECIFIC SCENARIO:
# ests <- "TMLE"
# RDplot <- results[["RDs"]][[1]][[ests]][[1]] %>%
# ggRD(t_int_sel = 1:5) %>%
# print
# ## GENERERATE RD PLOTS across all scenarios for these two estimators:
# ests <- c("MSM", "TMLE")
# longRDs <- results %>%
# select(trunc_wt, stratifyQ_by_rule, trunc_MSM, trunc_TMLE, RDs) %>%
# unnest(RDs) %>%
# gather(key = est, value = RDs, NPMSM, MSM.crude, MSM, GCOMP, TMLE, CVTMLE) %>%
# filter(est %in% ests) %>%
# mutate(RDplot = map(RDs, ~ ggRD(.x)))
# reqtrell <- requireNamespace("trelliscopejs", quietly = TRUE)
# if (reqtrell && FALSE) {
# longRDs %>%
# trelliscopejs::trelliscope(name = "test", panel_col = "RDplot")
# longRDs
# }
# h2o::h2o.shutdown(prompt = FALSE)
# }
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