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st: Survival analysis - lambda and its SE


From   [email protected]
To   [email protected]
Subject   st: Survival analysis - lambda and its SE
Date   Sun, 15 Apr 2007 15:23:04 -0300 (BRT)

Dear Statalisters,

I am running a survival analysis. In this respect, does anyone know how we
can calculate the lambda and its standard error after we obtain the
following results?


Exponential regression -- accelerated failure-time form

No. of subjects = 40                     Number of obs   =   40
No. of failures = 32
Time at risk    = 2059         LR chi2(1)      =      4.35
Log likelihood  = -38.159406   Prob > chi2     =    0.0371

-------------------------------------------------------------------
_t |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
---+----------------------------------------------------------------
group |   0.058095   .0266299     2.18   0.029     .0059    .1102
_cons |   1.193251   1.342353     0.89   0.374    -1.437    3.824
--------------------------------------------------------------------

I am not sure about this output. 1/lambda = exp(1.19+0.06*group)? However,
what about its standard error?



Thank you in advance.

Regards,


Tiago



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