may be what you need here. The Statalist FAQ (URL
below) points to the Stata FAQs as one source of help.
Nick
[email protected]
Saubhik
> I'm having some problem in stset-ing my panel data covering
> period from 1975 to
> 1999. This is how my data looks like:
>
> Id year spell duration censor x
> 1 1975 1 2 0 -0.67
> 1 1976 1 0 4.55
> 1 1977 0 0 2.68
> 1 1978 0 0 2.43
> 1 1979 0 0 3.23
> 1 1980 0 0 2.13
> 1 1981 1 2 0 -0.12
> 1 1982 1 0 -1.76
> 1 1983 0 0 0.34
> 1 1984 0 0 2.6
> 1 1985 0 0 2.58
> 1 1986 0 0 2.17
> 1 1987 0 0 2.54
> 1 1988 0 0 2.32
> 1 1989 0 0 2.29
> 1 1990 0 0 0.88
> 1 1991 0 0 1.32
> 1 1992 0 0 1.34
> 1 1993 0 0 1.66
> 1 1994 0 0 3.27
> 1 1995 0 0 2.52
> 1 1996 0 0 2.4
> 1 1997 0 0 2.72
> 1 1998 0 0 1.9
> 1 1999 0 0 -999
> 46 1975 0 0 0.5
> 46 1976 0 0 5.29
> 46 1977 0 0 2.1
> 46 1978 0 0 2.27
> 46 1979 0 0 2.53
> 46 1980 0 0 0.57
> 46 1981 1 4 0 -0.28
> 46 1982 1 0 -1.84
> 46 1983 1 0 1.1
> 46 1984 1 0 1.26
> 46 1985 0 0 0.19
> 46 1986 0 0 -0.49
> 46 1987 0 0 2.58
> 46 1988 0 0 3.6
> 46 1989 0 0 3.3
> 46 1990 0 0 2.2
> 46 1991 0 0 -0.17
> 46 1992 0 0 0.42
> 46 1993 0 0 0.41
> 46 1994 0 0 2.16
> 46 1995 0 0 3.9
> 46 1996 0 0 2.7
> 46 1997 1 3 1 1.62
> 46 1998 1 0 0.47
> 46 1999 1 0 -999
>
>
>
> My failure variable is 'spell'. Failure occurs when spell = 0. And the
> subject is at the risk of failure when spell=1. I'm interested in the
> transition from spell=1 to spell=0. Consequently, once a
> failure occurs all the
> subsequent failures are irrelevant until the subject is at risk again.
>
> so when I specify the 'origin(spell==1)' , that command sets
> the first observed
> spell=1 for that subject as origin. But ideally, that origin
> should change when
> the same subject comes under the risk of failure again.
>
> Another important thing is the duration of the risk of
> failure. For example, in
> my first observation, in 1975 and 1976 the subject is under
> the risk of failure
> and the failure is observed in 1977. So the duration of spell
> is 2 years and I
> want stata to record the 'x' value corresponding to 1975. But
> from the -st
> variable, I can see that stata is dropping that observation
> and retaining
> observation after 1976 which is irrelevant.
>
> And the '_d' variable is also surprising. It is supposed to
> denote the censored
> observations. But many a times _d=1 when the observation is
> not censored. In my
> data, censoring is an exogenous information which is captured
> by the variable
> 'censor'. When censor=1, then only that particular spell is censored.
>
>
> I gave the following command:
>
> stset year, id(cid) failure(spell==0) exit(year==1999)
> origin(spell==1) scale(1)
>
> And I know that I'm doing it wrong. I tried the snapspan
> command as well. Is
> there anyway, I can fix this problem.
>
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