用arm包中的standardize函数出现如下问题，怎么破？谢谢

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I am running a glmer (see below) using the lme4 package in R. The initial model runs fine with no warning messages. globalMat.model <- glmer(hatched~poly(MaternalAge,degree=2,raw=T)+Clutchnumber                         +ClutchSize +maternalweight+ (1|PairID) +                          (1|Year),data=crexMat, family=binomial)summary(globalMat.model) Following this I am using the arm package to standardise my global model. stdz.modelMAT<-standardize(globalMat.model, unchanged = NULL,                             standardize.y=FALSE, binary.inputs = "center")summary(stdz.modelMAT) the functions runs but i get the following warning Warning message:In is.na(thedata) : is.na() applied to non-(list or vector) of type 'NULL' I can't see why this would be. There are no NA's in the data set. Has anyone else had this problem or have any ideas about how to solve it? Thanks

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关键词：standardize Standard stand STAN DaR