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#'@title Extract p-values from a model object
#'
#'@description Extract p-values from a model object. Currently works with lm, glm, lme4, glmer,
#'and survreg model objects. If possible, uses the p-values reported in summary(model_fit).
#'If those do not exist (I'm looking at you, lme4), returns the Wald p-value:
#'2*pnorm(-abs(estimate / se))
#'
#'@param model_fit The model object from which to extract.
#'@keywords internal
#'@return Returns a vector of p-values. If model_fit is not a supported model type, returns NULL.
extractPvalues = function(model_fit, glmfamily = "gaussian") {
model_type = class(model_fit)
if ("lm" %in% model_type || "glm" %in% model_type || "glmerMod" %in% model_type) {
if(glmfamily != "exponential") {
return(coef(summary(model_fit))[, 4])
} else {
return(coef(summary(model_fit, dispersion = 1))[, 4])
}
}
if ("lmerMod" %in% model_type) {
estimates = coef(summary(model_fit))[, 1]
se = coef(summary(model_fit))[, 2]
return(2 * pnorm(-abs(estimates / se)))
}
if ("lmerModLmerTest" %in% model_type) {
return(coef(summary(model_fit))[, 5])
}
if ("survreg" %in% model_type) {
return(summary(model_fit)$table[, 4])
}
return(NULL)
}
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