Rstudent residual error

[Harry Stern]

Hi,

I am trying to generate a variable for the studentized residuals of a mixed effect model I am running. However, I get an error response when I try to generate this variable as shown below.

Here is a small portion of my data:

* Example generated by -dataex-. To install: ssc install dataex
clear
input long pid byte time float(PCS_score SPPB_score)
10002 1  50.7  5
10002 2 54.25  1
10002 3 57.58  6
10002 4 55.04  8
10005 1 39.31  4
10005 2 38.12  1
10005 3 47.52  7
10005 4 42.77  6
10008 1  57.4 11
10008 2 62.38  1
10008 3  57.4 10
10008 4 52.38 11
10011 1 50.87  9
10011 2 44.32  1
10011 3 45.19  7
10011 4 56.13  6
end

The code for my mixed effect model is this:

mixed PCS_score SPPB_score

And here is the code I am using to generate the studentized residuals with the error shown:

. predict resid, rstudent
option rstudent not allowed
r(198);

I can generate standardized residuals, but I would like to obtain the studentized residuals. Is this not possible for mixed effect linear regressions?

Thank you for any help.