st:survival data format

[getachew Emrie <getachew81@gmail.com>]

I was trying to set  my data in to survival data format. My Interest
is to look the duration of unemployment from CPS data.
The data i have has the following form.

  id   time     employment
  1      1               1
  1      2               1
  1      3               0
  1      4               0
  1      5               1
  2      1               1
  2      2               0
  2      3               1
  2      4               1

(employment=1 if employed and =0 if unemployed). My interest is to
follow the person when he/she enters in to unemployment and look the
time he/ she is going back to employment. Here failure is being
employed (=1). when i try to set it up using stset command with id and
failure=1,data starts with failure and stata ignores all the
observations after first failure. it tells me that most of the data
starts with failure. Is there any way tell stata to ignore failures
before risk of being unemployed  ( for example in the above data  i
want to ignore failures at time 1 and 2 and start at time 3 and then
fail at time 5 for id=1).

Thank you
Getachew.
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