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Re: st: Creating Seasonal Dummy Variables


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Creating Seasonal Dummy Variables
Date   Tue, 22 Apr 2014 08:19:08 +0100

No programming is needed, just some basic data management.

egen month = seq(), to(12)
tab month, gen(m)

Nick
njcoxstata@gmail.com


On 22 April 2014 06:14, Adam Guerrero <adamgue@gmail.com> wrote:
> Dear Statalisters,
>
> I have a dataset comprised of 168 observations, or 14 years worth of
> monthly data, on two variables, rooms and time.  Rooms is the number
> of occupied rooms in a hotel during a given month, and time is the
> current month ranging from 1 to 168.
>
> The data are time ordered.  So, the first observation in the dataset
> represents the first month of the first year, and the 168th
> observation in the dataset represents the last month of the last year,
> and so on.
>
> My goal is to create eleven seasonal dummy variables, m1-m11.  The
> month of December will be used as my reference category.  Thus,
>
> m1 will equal 1 for all January months, so m1 will equal 1 for
> observations 1, 13, 25, etc.
>
> m2 will equal 1 for all February months, m2 will equal 1 for
> observations 2, 14, 26, etc.
>
> I can write a looping statement to create empty dummies.  For example
>
> forvalues i = 1/11 {
>      generate m`i' = 0
> }
>
> But, I am experiencing an issue creating a looping command to fill in
> each variable with the appropriate values.  Actually, I would like to
> combine these tasks, if possible.
>
> I would be very thankful if a member of the statalist community would
> be willing to teach me how to create the 11 dummy variables with the
> appropriate values (leaving December out as the base case).
>
> I am new to programming, so pardon my current lack of knowledge, and
> thank you for your consideration.
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