Greetings,

Some of you may recognize my name from a few related posts but I just have
general question that perhaps can be clarified.  I have read several times
that 'lme' and 'lmer' are techniques capable of running data sets with
missing values.  Is this true?  I have put up similar posts where when I
try to run a two or three way interaction mixed model I get an error of
singularities or X'X not positive.  Does the data set need to be formatted
in some way where the mixed model can be run with all interactions?
Furthermore, if the missing values are 'not missing at random' is there
another method to follow for generating the mixed model?  I am just
confused why I see posts that lme can be run when data is missing.

Regards,

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