tests/testthat/test-example_statins.R

In multinma: Bayesian Network Meta-Analysis of Individual and Aggregate Data

# Generated by vignette example_statins.Rmd: do not edit by hand
# Instead edit example_statins.Rmd and then run precompile.R

skip_on_cran()



params <-
list(run_tests = FALSE)

## ---- code=readLines("children/knitr_setup.R"), include=FALSE-------------------------------------


## ---- eval = FALSE--------------------------------------------------------------------------------
## library(multinma)
## options(mc.cores = parallel::detectCores())

## ----setup, echo = FALSE--------------------------------------------------------------------------
library(multinma)
nc <- switch(tolower(Sys.getenv("_R_CHECK_LIMIT_CORES_")), 
             "true" =, "warn" = 2, 
             parallel::detectCores())
options(mc.cores = nc)


## -------------------------------------------------------------------------------------------------
head(statins)


## -------------------------------------------------------------------------------------------------
statin_net <- set_agd_arm(statins, 
                          study = studyc,
                          trt = trtc,
                          r = r, 
                          n = n,
                          trt_ref = "Placebo")
statin_net


## -------------------------------------------------------------------------------------------------
summary(normal(scale = 100))


## -------------------------------------------------------------------------------------------------
statin_fit_FE <- nma(statin_net, 
                     trt_effects = "fixed",
                     regression = ~.trt:prevention,
                     prior_intercept = normal(scale = 100),
                     prior_trt = normal(scale = 100),
                     prior_reg = normal(scale = 100))


## -------------------------------------------------------------------------------------------------
statin_fit_FE


## ---- eval=FALSE----------------------------------------------------------------------------------
## # Not run
## print(statin_fit_FE, pars = c("d", "beta", "mu"))


## ----statin_FE_pp_plot----------------------------------------------------------------------------
plot_prior_posterior(statin_fit_FE, prior = c("trt", "reg"))


## -------------------------------------------------------------------------------------------------
summary(normal(scale = 100))
summary(half_normal(scale = 5))


## ---- eval=!params$run_tests----------------------------------------------------------------------
## statin_fit_RE <- nma(statin_net,
##                      trt_effects = "random",
##                      regression = ~.trt:prevention,
##                      prior_intercept = normal(scale = 100),
##                      prior_trt = normal(scale = 100),
##                      prior_reg = normal(scale = 100),
##                      prior_het = half_normal(scale = 5),
##                      adapt_delta = 0.99)

## ---- eval=params$run_tests, echo=FALSE-----------------------------------------------------------
statin_fit_RE <- nowarn_on_ci(nma(statin_net, 
                     trt_effects = "random",
                     regression = ~.trt:prevention,
                     prior_intercept = normal(scale = 100),
                     prior_trt = normal(scale = 100),
                     prior_reg = normal(scale = 100),
                     prior_het = half_normal(scale = 5),
                     adapt_delta = 0.99))


## -------------------------------------------------------------------------------------------------
statin_fit_RE


## ---- eval=FALSE----------------------------------------------------------------------------------
## # Not run
## print(statin_fit_RE, pars = c("d", "beta", "mu", "delta"))


## ----statin_RE_pp_plot----------------------------------------------------------------------------
plot_prior_posterior(statin_fit_RE, prior = c("trt", "reg", "het"))


## -------------------------------------------------------------------------------------------------
(statin_dic_FE <- dic(statin_fit_FE))

## -------------------------------------------------------------------------------------------------
(statin_dic_RE <- dic(statin_fit_RE))


## ----statin_FE_resdev_plot------------------------------------------------------------------------
plot(statin_dic_FE)


## ----statin_RE_resdev_plot------------------------------------------------------------------------
plot(statin_dic_RE)


## -------------------------------------------------------------------------------------------------
statin_releff_FE <- relative_effects(statin_fit_FE,
                                     newdata = data.frame(prevention = c("Primary", "Secondary")),
                                     study = prevention)

statin_releff_FE


## ----statins_releff_FE, fig.height = 2------------------------------------------------------------
plot(statin_releff_FE, 
     ref_line = 0)


## ----statins_beta_FE, fig.height = 4--------------------------------------------------------------
plot(statin_fit_FE, 
     pars = "beta", 
     ref_line = 0,
     stat = "halfeye")


## ----statins_tests, include=FALSE, eval=params$run_tests------------------------------------------
#--- Test against TSD 3 results ---
library(testthat)
library(dplyr)

tol <- 0.05
tol_dic <- 0.1

# Relative effects
statin_FE_releff <- as.data.frame(summary(statin_fit_FE, pars = "d"))

test_that("FE relative effects", {
  expect_equivalent(statin_FE_releff$mean, -0.11, tolerance = tol)
  expect_equivalent(statin_FE_releff$sd, 0.10, tolerance = tol)
  expect_equivalent(statin_FE_releff$`2.5%`, -0.30, tolerance = tol)
  expect_equivalent(statin_FE_releff$`97.5%`, 0.09, tolerance = tol)
})

statin_RE_releff <- as.data.frame(summary(statin_fit_RE, pars = "d"))

test_that("RE relative effects", {
  expect_equivalent(statin_RE_releff$mean, -0.07, tolerance = tol)
  expect_equivalent(statin_RE_releff$sd, 0.20, tolerance = tol)
  skip_on_ci()
  expect_equivalent(statin_RE_releff$`2.5%`, -0.48, tolerance = tol)
  expect_equivalent(statin_RE_releff$`97.5%`, 0.36, tolerance = tol)
})

# Regression coefficients
statin_FE_beta <- as.data.frame(summary(statin_fit_FE, pars = "beta"))

test_that("FE regression beta", {
  expect_equivalent(statin_FE_beta$mean, -0.21, tolerance = tol)
  expect_equivalent(statin_FE_beta$sd, 0.11, tolerance = tol)
  expect_equivalent(statin_FE_beta$`2.5%`, -0.42, tolerance = tol)
  expect_equivalent(statin_FE_beta$`97.5%`, 0.01, tolerance = tol)
})

statin_RE_beta <- as.data.frame(summary(statin_fit_RE, pars = "beta"))

test_that("RE regression beta", {
  expect_equivalent(statin_RE_beta$mean, -0.29, tolerance = tol)
  expect_equivalent(statin_RE_beta$sd, 0.26, tolerance = tol)
  skip_on_ci()
  expect_equivalent(statin_RE_beta$`2.5%`, -0.86, tolerance = tol)
  expect_equivalent(statin_RE_beta$`97.5%`, 0.20, tolerance = tol)
})

# RE heterogeneity SD
statin_RE_sd <- as.data.frame(summary(statin_fit_RE, pars = "tau"))

test_that("RE heterogeneity SD", {
  expect_equivalent(statin_RE_sd$`50%`, 0.19, tolerance = tol)
  expect_equivalent(statin_RE_sd$sd, 0.20, tolerance = tol)
  skip_on_ci()
  expect_equivalent(statin_RE_sd$`2.5%`, 0.01, tolerance = tol)
  expect_equivalent(statin_RE_sd$`97.5%`, 0.76, tolerance = tol)
})

# DIC
test_that("FE DIC", {
  expect_equivalent(statin_dic_FE$resdev, 45.9, tolerance = tol_dic)
  expect_equivalent(statin_dic_FE$pd, 21.0, tolerance = tol_dic)
  expect_equivalent(statin_dic_FE$dic, 66.9, tolerance = tol_dic)
})

test_that("RE DIC", {
  expect_equivalent(statin_dic_RE$resdev, 42.6, tolerance = tol_dic)
  expect_equivalent(statin_dic_RE$pd, 24.2, tolerance = tol_dic)
  expect_equivalent(statin_dic_RE$dic, 66.8, tolerance = tol_dic)
})

test_that("Robust to custom options(contrasts) settings", {
  withr::with_options(list(contrasts = c(ordered = "contr.SAS",
                                         unordered = "contr.SAS")), {
    statin_fit_FE_SAS <- nma(statin_net, 
                         trt_effects = "fixed",
                         regression = ~.trt:prevention,
                         prior_intercept = normal(scale = 100),
                         prior_trt = normal(scale = 100),
                         prior_reg = normal(scale = 100))
    
    # Model pars are different (reference level of prevention is different) but
    # relative effects should still be calculated correctly
    statin_fit_FE_SAS_releff <- as_tibble(relative_effects(statin_fit_FE_SAS))[, c("parameter", "mean", "sd")]
  })

  expect_equal(statin_fit_FE_SAS_releff,
               as_tibble(relative_effects(statin_fit_FE))[, c("parameter", "mean", "sd")],
               tolerance = tol)
})