tern (version 0.9.8)

try_car_anova: tryCatch around car::Anova

Description

Captures warnings when executing car::Anova.

Usage

try_car_anova(mod, test.statistic)

Value

A list with item aov for the result of the model and error_text for the captured warnings.

Arguments

mod

lm, aov, glm, multinom, polr mlm, coxph, coxme, lme, mer, merMod, svyglm, svycoxph, rlm, clm, clmm, or other suitable model object.

test.statistic

for a generalized linear model, whether to calculate "LR" (likelihood-ratio), "Wald", or "F" tests; for a Cox or Cox mixed-effects model, whether to calculate "LR" (partial-likelihood ratio) or "Wald" tests (with "LR" tests unavailable for Cox models using the tt argument); in the default case or for linear mixed models fit by lmer, whether to calculate Wald "Chisq" or Kenward-Roger "F" tests with Satterthwaite degrees of freedom (warning: the KR F-tests can be very time-consuming). For a multivariate linear model, the multivariate test statistic to compute --- one of "Pillai", "Wilks", "Hotelling-Lawley", or "Roy", with "Pillai" as the default. The summary method for Anova.mlm objects permits the specification of more than one multivariate test statistic, and the default is to report all four.

Examples

# `car::Anova` on cox regression model including strata and expected
# a likelihood ratio test triggers a warning as only Wald method is
# accepted.

library(survival)

mod <- coxph(
  formula = Surv(time = futime, event = fustat) ~ factor(rx) + strata(ecog.ps),
  data = ovarian
)