I am sorry for the confusion: -d- is the dummy variable reflecting change of state from negative to positive (0,1). The final data set would be similar to one appended below.
David
----- Original Message -----
From: Nick Cox <njcoxstata@gmail.com>
To: statalist@hsphsun2.harvard.edu
Cc:
Sent: Friday, December 7, 2012 8:18:22 PM
Subject: Re: st: generate Spell Counter or Duration Variable
Somebody else may understand this, but I don't think this is complete.
What's -d-, for example?
Nick
On Fri, Dec 7, 2012 at 4:52 PM, David Ashcraft <ashcraftd@rocketmail.com> wrote:
> Hi Statalist,
>
> I wanted to generate a duration variable to determine, how long a firm remained in a specific state. the dataset is panel where T>N. The change in state of the firm is explained by a dummy variable. The duration variable as shown below capture duration of each spell. I thought of using -xi i.d- but it generate the same variable as -d-.
>
> id date2 d Duration
> 1 16587 1 1
> 1 16617 1 2
> 1 16646 1 3
> 1 16679 0 0
> 1 16709 1 1
> 1 16740 0 0
> 1 16770 1 1
> 1 16800 0 0
> 1 16832 1 1
> 1 16860 0 0
> 1 16891 1 1
>
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