Hi, I am pretty new to using syntax and having an issue with the same error code. I previously ran the syntax OK using V.21 but running on V.25:

"Mixed Text: number Command: mixed

An undefined variable name, or a scratch or system variable was specified in a variable list which accepts only standard variables. Check spelling and verify the existence of this variable.

Execution of this command stops." It may be the syntax needs to be updating? I have tried troubleshooting/cleaning data - to no avail though. All variable names ARE valid according to IBM user guide etc...

Syntax:

mixed probac_post BY treatment period volunteer_id number WITH probac_pre

/fixed = probac_pre period treatment

/random intercept | subject(volunteer_id) covtype(vc)

/repeated number | subject(volunteer_id*period) covtype(diag)

/emmeans =TABLES(treatment) compare(treatment).

VARIABLE NAME LIST (9/33 of the variable names)

volunteer_id

period

treatment

ei_pre

ei_post

bif_pre

bif_post

probac_pre

probac_post

I don't see the number variable in your variable list.

Hi Jon, thanks for responding. There is no number variable. I came up with this syntax with help of a statistician - I assumed it was part of the command, however I can't remove it as it in the repeated command...I think you're right, this is the problem part of the syntax...

Ps - I have 2 treatments (1 and 2), 2 periods (pre and post), and volunteer ID . The other variables consist of the values. So I'm not sure if I take out "number" what to replace with in repeated command...I am referring to the mixed model guide and syntax commands guide but it is difficult when you're not used to this language. I like syntax though...that said!

I don't know what that variable is supposed to represent, but it has to exist to include it in the command. Maybe it should be period here.