#' @title
#' Do univariable logistic regression and extract results in nice format.
#'
#' @description
#' A helper function to be used in a loop to do univariable regression and give
#' some nice lookin' results/
#'
#' @param data a data frame or tibble
#' @param formula A character string
#' @param format Display format in case I need to escape some characters. A
#' place holder for now in case I need it in the future. Default is "html".
#' @param conf_level The confidence level to use for the confidence interval.
#' Must be strictly greater than 0 and less than 1. Defaults to 0.95, which
#' corresponds to a 95 percent confidence interval.
#' @param exponentiate Logical indicating whether or not to exponentiate the
#' the coefficient estimates. This is typical for logistic and multinomial
#' regressions, but a bad idea if there is no log or logit link. Defaults to
#' `TRUE`.
#' @param include_last_row Adds a row at the end of each set of results to give
#' some breathing room. Default is `TRUE`.
#' @param ... Additional arguments
#'
#' @importFrom broom tidy
#' @importFrom car Anova
#' @importFrom dplyr arrange
#' @importFrom dplyr bind_rows
#' @importFrom dplyr case_when
#' @importFrom dplyr coalesce
#' @importFrom dplyr filter
#' @importFrom dplyr if_else
#' @importFrom dplyr left_join
#' @importFrom dplyr mutate
#' @importFrom dplyr mutate_all
#' @importFrom dplyr mutate_at
#' @importFrom dplyr na_if
#' @importFrom dplyr rename
#' @importFrom dplyr select
#' @importFrom glue glue
#' @importFrom janitor clean_names
#' @importFrom labelled var_label
#' @importFrom purrr map
#' @importFrom purrr pluck
#' @importFrom stringr str_detect
#' @importFrom stringr str_remove
#' @importFrom stringr str_remove_all
#' @importFrom tibble as_tibble
#' @importFrom tibble rownames_to_column
#' @importFrom tibble tibble
#' @importFrom tidyr crossing
#' @importFrom tidyr unnest
#'
#' @return A tibble or data frame
.do_logistic_univ <- function(data,
formula,
format = "html",
conf_level = 0.95,
exponentiate = TRUE,
include_last_row = TRUE, ...) {
#### Fit the model --------------------------------
fit <- glm(formula = as.formula(formula),
family = binomial(link = "logit"),
data = data)
# independent <- attr(fit$terms, "term.labels")[[1]]
independent <- attr(fit$terms, "term.labels")
outcome <- names(fit$model)[1]
indep_split <- unlist(stringr::str_split(independent, ":"))
indep_split <- paste0(indep_split, collapse = "|")
#### Overall p-value --------------------------------
lrt_pval <- drop1(fit, test = "LRT") %>%
purrr::pluck(., "Pr(>Chi)", 2)
res_overall <- tibble::tibble(
covariate = independent,
term = NA_character_,
ref = NA_character_,
estimate = NA_real_,
lower_ci = NA_real_,
upper_ci = NA_real_,
p_value_wald = NA_real_,
p_value_lrt = lrt_pval,
signif = .calc_sig_ind(p_value_lrt, format)
)
#### Results by level --------------------------------
if (any(class(data[[independent]]) %in% c("factor",
"ordered",
"logical",
"character"))) {
x_levels <- fit %>%
purrr::pluck(.,
"xlevels",
1) %>%
.[-c(1)]
res_by_level <- fit %>%
broom::tidy(.,
conf.int = TRUE,
conf.level = conf_level,
exponentiate = exponentiate) %>%
janitor::clean_names() %>%
dplyr::filter(term != "(Intercept)") %>%
# mutate(term = stringr::str_remove(term, independent),
mutate(# term = stringr::str_remove_all(term, indep_split),
term = x_levels,
ref = NA_character_,
covariate = "") %>%
dplyr::select(covariate,
term,
estimate,
lower_ci = conf_low,
upper_ci = conf_high,
p_value_wald = p_value) %>%
mutate(p_value_lrt = NA_real_,
signif = .calc_sig_ind(p_value_wald, format))
fct_ref_lev <- levels(data[[independent]])[[1]]
row_one <- tibble::tibble(
covariate = NA_character_,
# term = as.character(glue::glue("Ref lvl = {fct_ref_lev}")),
term = fct_ref_lev,
ref = "Reference level",
estimate = NA_real_,
lower_ci = NA_real_,
upper_ci = NA_real_,
p_value_wald = NA_real_,
p_value_lrt = NA_real_,
signif = NA_character_)
res_by_level <- dplyr::bind_rows(row_one,
res_by_level)
} else if (any(stringr::str_detect(independent, ":"))) {
res_by_level <- fit %>%
broom::tidy(.,
conf.int = TRUE,
conf.level = conf_level,
exponentiate = exponentiate) %>%
janitor::clean_names() %>%
dplyr::filter(term != "(Intercept)") %>%
# mutate(term = stringr::str_remove(term, independent),
mutate(term = stringr::str_remove_all(term, indep_split),
ref = NA_character_,
covariate = "") %>%
dplyr::select(covariate,
term,
estimate,
lower_ci = conf_low,
upper_ci = conf_high,
p_value_wald = p_value) %>%
mutate(p_value_lrt = NA_real_,
signif = .calc_sig_ind(p_value_wald, format))
# fct_ref_lev <- levels(data[[independent]])[[1]]
fct_ref_lev <- "TBD"
row_one <- tibble::tibble(
covariate = NA_character_,
# term = as.character(glue::glue("Ref lvl = {fct_ref_lev}")),
term = fct_ref_lev,
ref = "Reference level",
estimate = NA_real_,
lower_ci = NA_real_,
upper_ci = NA_real_,
p_value_wald = NA_real_,
p_value_lrt = NA_real_,
signif = NA_character_)
res_by_level <- dplyr::bind_rows(row_one,
res_by_level)
} else {
res_by_level <- fit %>%
broom::tidy(.,
conf.int = TRUE,
conf.level = conf_level,
exponentiate = exponentiate) %>%
janitor::clean_names() %>%
dplyr::filter(term != "(Intercept)") %>%
mutate(covariate = "",
term = "",
ref = "") %>%
dplyr::select(covariate,
term,
ref,
estimate,
lower_ci = conf_low,
upper_ci = conf_high,
p_value_wald = p_value) %>%
mutate(p_value_lrt = NA_real_,
signif = .calc_sig_ind(p_value_wald, format))
}
#### Combine results --------------------------------
if (include_last_row == TRUE) {
last_row <- tibble::tibble(
covariate = NA_character_,
term = NA_character_,
ref = NA_character_,
estimate = NA_real_,
lower_ci = NA_real_,
upper_ci = NA_real_,
p_value_wald = NA_real_,
p_value_lrt = NA_real_,
signif = NA_character_)
res <- dplyr::bind_rows(
res_overall,
res_by_level,
last_row)
} else {
res <- dplyr::bind_rows(
res_overall,
res_by_level)
}
res
}
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