Thanks @PaigeMiller! It appears to have run without a problem. I'm not sure why I thought I had to create the variable first. I did run the same data with proc reg earlier on and this was the log: 1406 PROC reg data= work;*Final model; 1407 MODEL StdTotalsubcut_b_cond = StdHealth Primiparity bsex Health*bsex; - 22 200 NOTE: The previous statement has been deleted. ERROR 22-322: Syntax error, expecting one of the following: a name, ;, -, /, :, _ALL_, _CHARACTER_, _CHAR_, _NUMERIC_, {. ERROR 200-322: The symbol is not recognized and will be ignored. 1408 RUN; WARNING: No variables specified for an SSCP matrix. Execution terminating. NOTE: PROCEDURE REG used (Total process time): real time 0.00 seconds cpu time 0.00 seconds
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