topic Re: Equivalent to PROC LOGISTIC-UNITS statement in PROC GENMOD in Statistical Procedures

Equivalent to PROC LOGISTIC-UNITS statement in PROC GENMOD

Jack_Smitherson — Wed, 11 Oct 2017 21:47:15 GMT

In Proc Logistic we can add 'Units" statement to change the unit of the explanatory variable. Is there any equivalent statement in Proc Genmod procedure?

Instead of one unit change in the covariate "X1" I need 5 units change in "X1".

X1 and X1 are continuous.

Example:

proc genmod data=example DESCENDING;

model epid = x1 x2 female race;

estimate "X1" X1 1 / exp;

run;

Thanks!

Re: Equivalent to PROC LOGISTIC-UNITS statement in PROC GENMOD

SAS_Rob — Thu, 12 Oct 2017 14:00:55 GMT

There is no UNITS statement per se, but you can use the unit of change of the coefficient on the ESTIMATE statement.

estimate "X1-5 unit change" X1 5 / exp;

Re: Equivalent to PROC LOGISTIC-UNITS statement in PROC GENMOD

CharleneG — Thu, 08 Feb 2018 06:43:11 GMT

In that same vein, is there a way to use the ESTIMATE function to output the estimate for a 1 standard deviation change of that independent variable?

For example,

proc genmod data= test;

model bloodpressure= X1 age sex /link=identity dist=normal;

estimate "X1- 1 SD change" X1 1*SD?;

run;

Thanks!

Re: Equivalent to PROC LOGISTIC-UNITS statement in PROC GENMOD

StatDave — Thu, 08 Feb 2018 15:53:07 GMT

Just compute the standard deviation and specify that value in the ESTIMATE statement as above.

Re: Equivalent to PROC LOGISTIC-UNITS statement in PROC GENMOD

CharleneG — Thu, 08 Feb 2018 15:56:33 GMT

Thanks! I was hoping it could be automated as I will be running this as part of a macro.

Re: Equivalent to PROC LOGISTIC-UNITS statement in PROC GENMOD

SAS_Rob — Thu, 08 Feb 2018 16:08:40 GMT

If you need to automate you could simply run a Proc MEANS prior to running LOGISTIC and save the standard deviation to a MACRO variable.