st: Limiting analysis time in Survival Analysis

[Lisa Sharwood <lisans@unimelb.edu.au>]

Hello
I have data with which I have performed a survival analysis graph, 
which represents the probability of seizure freedom over time in 
Years in the analysis.  Now I am trying to re-analyse that data 
limiting the analysis time to after two years in the analysis.  I am 
having difficulty doing this - as if I use a new variable created 
with only the pts who remain IN the study after two years and then do 
the analysis, it gives me a flat line for one variable which is 
incorrect.   I have tried to limit the axis - ie setting the scale 
but am told  in the manuals that stata will not do this.
I hope this makes sense.. thanks for your suggestions.
Lisa
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