topic Re: Baseline in PHREG with class statement in Statistical Procedures

Baseline in PHREG with class statement

joesmama — Thu, 06 Jun 2019 18:42:30 GMT

Hello,

When using PROC PHREG,

If my model is made up of entirely categorical variables and each of those variables is put in the class statement with a reference group, do I still need to use the BASELINE option to define the reference group for the model? Or is this redundant?

proc phreg data=grands plots=survival;

class grade(ref="Grade 1") gender(ref="Male") marst(ref="Married") stage(ref="Stage 1");
model survivem*cs_vital(0) = grade gender marst;
by stage;
run;

Thank you.

Re: Baseline in PHREG with class statement

Reeza — Thu, 06 Jun 2019 19:25:54 GMT

@joesmama wrote:

do I still need to use the BASELINE option to define the reference group for the model? Or is this redundant?

That's not what the baseline statement does.

The BASELINE statement creates a SAS data set (named by the OUT= option) that contains the baseline function estimates at the event times of each stratum for every set of covariates in the COVARIATES= data set.

The default reference values are used if not specified elsewhere, if that's what you're asking.

@joesmama wrote:

Hello,

When using PROC PHREG,

If my model is made up of entirely categorical variables and each of those variables is put in the class statement with a reference group, do I still need to use the BASELINE option to define the reference group for the model? Or is this redundant?

proc phreg data=grands plots=survival;

class grade(ref="Grade 1") gender(ref="Male") marst(ref="Married") stage(ref="Stage 1");
model survivem*cs_vital(0) = grade gender marst;
by stage;
run;

Thank you.

Re: Baseline in PHREG with class statement

joesmama — Thu, 06 Jun 2019 19:57:26 GMT

Yes, its was the COVARIATES dataset I meant. Thanks for the help.