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st: RE: How to construct a duration variable?


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: How to construct a duration variable?
Date   Thu, 6 Apr 2006 18:23:14 +0100

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.

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