带有anova()的lme4软件包中的错误 [英] bug in lme4 package with anova()

问题描述

library(Matrix)
library(lme4)


data <- lme4::sleepstudy

model1 <- lm(Reaction ~ Days, data = data)
model2 <- lmer(Reaction ~ 1+Days+(1+Days|Subject), data = data)
summary(model1)
summary(model2)
anova(model1, model2)

所以我需要将R更新到4.0.2，现在使用 anova 函数比较混合效果模型会返回错误.当我分配模型时，似乎出现了错误，因为在全局环境中，它说带空指针的对象".该错误似乎仅使用 lmer 出现，而不是使用 lm .谁能告诉我该如何解决?我至少需要R版本4.0.0(我的教授写的脚本需要此版本).

So I needed to update R to 4.0.2 and now comparing mixed effects models using the anova function returns an error. The error seems to appear when I assign the model because in the global environment it says "object with null pointer". The error seems only to appear using lmer and not with lm. Can anybody tell me how to fix this? I need at least R version 4.0.0 (my professor writes scripts that require this version).

推荐答案

可接受的解决方案(明确地调用 lme4 :: anovaLmer())有效，但是这里的实际问题是，如果您想运行 anova()比较一个(n) [g] lm 模型和一个(n) [g] lmer 模型，您需要将[g] lmer模型放在参数列表中，因为<因为无聊的技术细节:S3方法调度等等等等.(这应该记录在案，不是我能告诉的.)对于您的示例，

The accepted solution (explicitly call lme4::anovaLmer()) works, but the actual problem here is that if you want to run anova() comparing a(n) [g]lm model and a(n) [g]lmer model, you need to put the [g]lmer model first in the list of arguments, <because ... boring technical details: S3 method dispatch blah blah blah ...>. (This should be documented, and isn't that I can tell.) For your example,

anova(model2,model1)

工作正常！

具有空指针的对象"；错误是红色鲱鱼:无关，神秘，可能与RStudio有关，另请参见问题和

The "object with null pointer" error is a red herring: unrelated, mysterious, probably RStudio-related, see also this question and this question (neither is answered ...)

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