Life table

[Younes Jahangiri]

Hi dear Statalists,

I am using ltable command to generate Kaplan-Meier life table. But the calculated survivals don't match with my calculations. I have copied the tables below.

In the first table, the 12-month survival should be: (65-17)/65 = 0.7385. What I am seeing in the calculated table is 0.6699.
In the second table, the 12-month survival should be: (65-11)/65 = 0.8308. What I am seeing in the calculated table is 0.7800.
In the third table, the 12-month survival should be: (65-3)/65 = 0.9538. What I am seeing in the calculated table is 0.9368.

I was wondering where the differences do come from? Am I using a wrong calculation method?

Thank you in advance,

Younes

[Joseph Coveney]

See the Methods and Formulas section of the user's manual entry for ltable. You'd probably agree with Stata if you used the noadjust option.