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...like to pass a model formula as an argument to the with.mids function from the mice package. The with.mids functon fits models to multiply imputed data sets. Here's a simple example library(mice) #Create multiple imputations on the nhanes data contained in the mice package. imp <- mice(nahnes) #Fitting a linear model with each imputed data set the regular way works fine with(imp, lm(bmi~hyp+chl)) #Creating a formula object and than passing it as argument does not work: form.obj <- formula(bmi~hyp+chl) with(imp, lm(form.obj)) #The following doesn't work either expr <-&quo...