Programming the statistical procedures from SAS

Comparing survival curves at multiple timepoints

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Contributor
Posts: 27

Comparing survival curves at multiple timepoints

[ Edited ]

I have run a PROC LIFEREG and have obtained a LR p-value comaring 2 strata. I would additionally like to compare my survival curves and get p-values at specific timepoints. How can I go about doing this?

 

Here is my code for the overall survival analysis:

 

proc lifetest data=dat maxtime=60 plots=survival(cl atrisk(maxlen=13 outside(0.15)) test);
    time fu*fail(0);
    strata group / test=logrank;
    symbol1 v=none color=blue line=1;
    symbol2 v=none color=red line=2;
    label fu = "Follow-up, mo";
run;

 

I would like to compare my curves at 24 and 36 months.

Frequent Contributor
Posts: 79

Re: Comparing survival curves at multiple timepoints

Melk,

 

  It may depend what you mean by "compare".  Forgive the brevity and potentially tangential citation, but you may find:

 

 

Caution: Hazards Crossing! Using the Renyi Test Statistic in Survival Analysis

 

https://www.pharmasug.org/proceedings/2011/SP/PharmaSUG-2011-SP06.pdf

 

of interest.

 

Good luck,

 

Kevin

Contributor
Posts: 27

Re: Comparing survival curves at multiple timepoints

Thank you - to answer my own question, I used the proportion surviving and standard error to perform a 2 sample z test.

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