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Please send me (jkpeck@gmail.com) an spv file containing the table where this fails, and I'll check it out. Also, what SPSS version are you on?

When standardizing, this procedure uses the PROXIMITIES procedure for that step, however in SPSS 30, there was a problem that prevented PROXIMITIES from running. This was addressed in this interim fixhttps://www.ibm.com/support/fixcentral/swg/doSelectFixes?options.selectedFixes=30.0.0.0-IM-S30STAT-A ...

Note also that there is document under Help > Doc in PDF format on writing extension commands herehttps://www.ibm.com/docs/SSLVMB_31.0.0/pdf/Writing_IBM_SPSS_Statistics_Extensions_Commands.pdf -- Jon K Peck jkpeck@gmail.com

Elsewhere in this thread you mention a Shiny interface. My experience with Shiny running from within SPSS has been that when I close the Shiny app, SPSS hangs. I don't know whether the problem is on the Shiny end or on SPSS, but it is something to watch out for. Also, with the SPSS custom dialog ...

I have not looked at this new package so I can't comment on it, but as a reminder, there is the STATS EXRASCH extension command available from the Extension Hub. It estimates a standard Rasch model and five extended models. -- Jon K Peck jkpeck@gmail.com