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RE: st: RE: How to construct a duration variable?


From   Nick Winter <nw53@cornell.edu>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: RE: How to construct a duration variable?
Date   Thu, 06 Apr 2006 16:13:52 -0400

Good point.  Drat.



At 04:05 PM 4/6/2006, you wrote:
Not so. Each person can have one or more
spells on each -Brand-. Your code lumps
them all together.

Nick
n.j.cox@durham.ac.uk

Nick Winter

> I think
>
>    bysort hhid Brand: gen Duration=_N
>
> should do it.
>
> --Nick Winter
>
> At 01:42 PM 4/6/2006, you wrote:
> >Thank you, Nick.
> >
> >For example,  there are three brands in the market: A, B and C.  One
> >consumer buy A at the first period.  At the second period, she
> >switches to B.  Since then, she keeps buying B for the next four
> >periods.  After that, she switches to C etc.
> >
> >Then the duration variable I want should be:
> >
> >hhid    Period   Brand    Switch  Duration
> >1         1         A           0           1
> >1         2         B           1           4
> >1         3         B           0           4
> >1         4         B           0           4
> >1         5         B           0           4
> >1         6         C           1           2
> >1         7         C           0           2
> >1         8         A           1           1
> >1         9         B           1           4
> >1        10         B           0           4
> >1        11         B           0           4
> >1        12         B           0           4
> >1        13         C           1           2
> >1        14         C           0           2
> >
> >I wish that it's clear this time.  I just not sure how to construct
> >the duration variable in Stata.


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________________________________________________________
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Assistant Professor 607.255.4530 f
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