interaction term with a continuous variable in PHREG

Raymond-milan — Mon, 29 Jul 2019 18:29:06 GMT

Hello,

I'm trying to include an interaction term in my cox regression model; one is a categorical variable (severite2=Mild or severe) and the second is continous (AgeAtAgentDate). Althouh i can see the HR estimates for all other variables in the model (the table is attached), I cannot see the HR estimates for the interaction term (AgeAtAgentDate, severite, severite*AgeAtAgentDate).

proc phreg data=RMDATA.CCDAnalysis NAMELEN=100 MULTIPASS;

class Severite2(ref="Mild") / param=ref;

model TimetoHospitDeathcardioByYear*HospitDeathByCardio(0)= severite|AgeAtAgentDate Urbain male NSRG

/ SELECTION=B SLS=1 include=1 ties=discrete rl;

ods output ParameterEstimates=EstimCCD ModelBuildingSummary=MSCCD;

OUTPUT OUT=OUT XBETA=x;

run;

Re: interaction term with a continuous variable in PHREG

Reeza — Mon, 29 Jul 2019 21:48:30 GMT

@Raymond-milan wrote:

Hello,

I'm trying to include an interaction term in my cox regression model; one is a categorical variable (severite2=Mild or severe) and the second is continous (AgeAtAgentDate). Althouh i can see the HR estimates for all other variables in the model (the table is attached), I cannot see the HR estimates for the interaction term (AgeAtAgentDate, severite, severite*AgeAtAgentDate).

proc phreg data=RMDATA.CCDAnalysis NAMELEN=100 MULTIPASS;

class Severite2(ref="Mild") / param=ref;

model TimetoHospitDeathcardioByYear*HospitDeathByCardio(0)= severite|AgeAtAgentDate Urbain male NSRG

/ SELECTION=B SLS=1 include=1 ties=discrete rl;

ods output ParameterEstimates=EstimCCD ModelBuildingSummary=MSCCD;

OUTPUT OUT=OUT XBETA=x;

run;

You need to add explicit hazardratio statements to get interaction estimates. See the HAZARDRATIO documentation for more details on the specification.

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interaction term with a continuous variable in PHREG

Re: interaction term with a continuous variable in PHREG