From ed4d85b9f11ab3eff973718dcaf94422601010d4 Mon Sep 17 00:00:00 2001 From: Daniel Date: Tue, 6 Feb 2024 08:58:38 +0100 Subject: [PATCH] fix for nbinom2? --- R/check_model_diagnostics.R | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/R/check_model_diagnostics.R b/R/check_model_diagnostics.R index db3652197..55797cab8 100644 --- a/R/check_model_diagnostics.R +++ b/R/check_model_diagnostics.R @@ -300,9 +300,16 @@ d <- data.frame(Predicted = stats::predict(model, type = "response")) d$Residuals <- insight::get_residuals(model, type = "pearson") d$Res2 <- d$Residuals^2 - d$V <- insight::get_sigma(model)^2 * stats::family(model)$variance(d$Predicted) d$StdRes <- insight::get_residuals(model, type = "pearson") + if (faminfo$family == "nbinom1") { + # for nbinom1, we can use "sigma()" + d$V <- insight::get_sigma(model)^2 * stats::family(model)$variance(d$Predicted) + } else { + # for nbinom2, "sigma()" has "inverse meaning" (see #654) + d$V <- (1 / insight::get_sigma(model)^2) * stats::family(model)$variance(d$Predicted) + } } else { + ## FIXME: this is not correct for glm.nb models? d <- data.frame(Predicted = stats::predict(model, type = "response")) d$Residuals <- insight::get_response(model) - as.vector(d$Predicted) d$Res2 <- d$Residuals^2