I know. The duration variable in my first email could be made by
muliplying the duration variable in my second email with switch
variable. And I think the duration variable in my second email makes
more sense.
Thanks,
Albert
On 4/6/06, Alex Ogan <aogan@arrowstreetcapital.com> wrote:
> This doesn't match your first example table -- the first time, you had
> duration == 0 in all cases that a switch did not take place.
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Albert Newton
> Sent: Thursday, April 06, 2006 1:42 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: RE: How to construct a duration variable?
>
> 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.
>
> Thanks,
>
> Albet
>
>
>
>
>
> On 4/6/06, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> > I think you are going to need to explain how "Duration"
> > is calculated. The numerical example is not
> > clear to me.
> >
> > Nick
> > n.j.cox@durham.ac.uk
> >
> > Albert Newton
> >
> > > I get stuck in coding a during variable. The data is like:
> > >
> > > hhid weekshoppingday triptype switch switchtype
> > > Duration
> > > 1871877 954 7 1 0 0 0
> > > 1871877 955 7 2 1 2 1
> > > 1871877 956 3 1 1 4 1
> > > 1871877 957 6 0 1 1 1
> > > 1871877 958 7 1 1 6 3
> > > 1871877 959 7 1 0 0 0
> > > 1871877 960 7 1 0 0 0
> > > 1871877 961 7 0 1 1 1
> > > 1871877 962 7 2 1 5 1
> > > 1871877 963 4 1 1 4 3
> > > 1871877 964 2 1 0 0 0
> > > 1871877 964 7 1 0 0 0
> > >
> > > I just wanto count how long the customer stay in the switched
> shopping
> > > type. Could any one give some suggestion of how to constuct the
> > > variable "Duration"?
> > > The one above is make manually.
> >
> > *
> > * For searches and help try:
> > * http://www.stata.com/support/faqs/res/findit.html
> > * http://www.stata.com/support/statalist/faq
> > * http://www.ats.ucla.edu/stat/stata/
> >
>
> *
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>
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>
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