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Re: st: comparing -ltable- and -sts list-

From   Michael McCulloch <>
Subject   Re: st: comparing -ltable- and -sts list-
Date   Sun, 2 Nov 2008 17:03:47 -0800

Thanks Phil.

Is there a way to use -sts list- to statistically compare the 2-year survival rates between two groups? I notice that the -compare- option simply places them next to each other without a statistical test.



use the   -noadjust-   option  on  -ltable-

from -help ltable- :

noadjust suppresses the actuarial adjustment for deaths and censored observations. The default is to consider the adjusted number at risk at the start of the interval to be total at the start minus (the number dead or censored)/2. If noadjust is specified, the number at risk is simply the total at the start, corresponding to the standard Kaplan-Meier assumption. noadjust should be specified when using ltable to list results corresponding to those
        produced by sts list.


At 09:51 AM 3/11/2008, you wrote:
Dear Statalist members,
I had the impression that both -ltable- and -sts list- would list the survivor function per failure period. However, they give slightly different answers. In the example below, for drug3 -ltable- shows survival at 24 months as 77.14%, whereas -sts list- says it's 64.29%

sysuse cancer.dta, clear
sts list, by(drug)
ltable _t died, by(drug)

Could anyone help me to clarify this?


Best wishes,
Michael McCulloch

Pine Street Foundation
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