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# Re: st: Creating Seasonal Dummy Variables

 From Adam Guerrero <[email protected]> To [email protected] Subject Re: st: Creating Seasonal Dummy Variables Date Tue, 22 Apr 2014 09:25:21 -0500

```Seeing these commands in action has been extremely informative. Thank
you for your response, Mr. Baum.

On Tue, Apr 22, 2014 at 8:05 AM, Christopher Baum <[email protected]> wrote:
> <>
>
> clear
> set obs 168
> // arbitrary starting point in Stata's calendar
> g mo = 119 + _n
> format mo %tm
> tsset mo, monthly
> g seas = month(dofm(mo))
> // don't need seasonal dummies to use seas
> g junk = runiform()
> reg junk ibn.seas, noco hascons
> // but if you really want them...
> tab seas, gen(M)
> reg junk M*, noco hascons
>
> On Apr 22, 2014, at 2:33 AM, Adam wrote:
>
>> 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.
>
>
>
>
> Kit Baum
> Professor of Economics and Social Work, Boston College, Chestnut Hill MA, USA
> DIW Research Professor, Department of Macroeconomics, DIW Berlin, Berlin, Germany
> [email protected]  |  http://ideas.repec.org/e/pba1.html
>
>
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```