[R] computationally singular error with mice()

[Fei]

Hi Weidong,

Thank you for the clear explanation. You are right it is not the categorical
variables that are causing the trouble. It might be the relatively small
number of sample that causing the problem given so many variables. I tried
to exclude some variables that are not essential to all the analyses I am
going to conduct and get the commands run successfully. Thank you.

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