@jiltao Thank you for this! Highly appreciated! ... View more

@Ksharp , thank you!!! This is helpful! ... View more

For your first question, if "amount of substance use will be in ranges, " a.k.a it is a category variable, You could try PROC FREQ 's trend analysis: https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.3/statug/statug_freq_examples08.htm For your second question, maybe you could try PROC CATMOD. https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.3/statug/statug_catmod_syntax.htm But I don't know how to code it. ... View more

For your first question, if "amount of substance use will be in ranges, " a.k.a it is a category variable, You could try PROC FREQ 's trend analysis: https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.3/statug/statug_freq_examples08.htm For your second question, maybe you could try PROC CATMOD. https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.3/statug/statug_catmod_syntax.htm But I don't know how to code it. ... View more