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# Re: st: How to Define MDY Variable Given Separate Y and MD Variables

 From Nick Cox To statalist@hsphsun2.harvard.edu Subject Re: st: How to Define MDY Variable Given Separate Y and MD Variables Date Mon, 30 May 2011 10:30:57 +0100

```I understand that holidays are different, but I don't understand what
you want precisely other than your first sentence. But getting a
single date variable follows from the principles explained in -help
dates_and_times-.

Your example cannot be literal, as Stata would not allow the variable
name -date-month- with an embedded hyphen. I will guess at an
underscore, that your -date_month- variable is string, and that your
-year-  variable is numeric, in which case try something like

gen date = date(day_month + string(year), "DMY")
format date %td_d_m_CY

What the data look like is secondary; use -describe- in such questions
to tell us what they are, especially if this is not enough advice.

Nick

On Mon, May 30, 2011 at 9:44 AM, Muhammad Anees <aneesmkhattak@gmail.com> wrote:

> I have been trying to define a singe data variable from the given two
> date variables named YEAR and DATE-MONTH for data from from Jan 01,
> 2005 to Dec 31, 2010. Also the month variable has breaks for holidays.
> I need to merge the two variable so I could define the yearly specific
> date with month to compare trends of stocks across the years.
>
> The data looks like
>
> . li    year day-month in       1/20
>
>        +-----------------+
>        year   day-month
>        -----------------
> 1.      2010     31-Dec
> 2.      2010     30-Dec
> 3.      2010     29-Dec
> 4.      2010     28-Dec
> 5.      2010     27-Dec
>        -----------------
> 6.      2010     24-Dec
> 7.      2010     23-Dec
> 8.      2010     22-Dec
> 9.      2010     21-Dec
> 10.     2010     20-Dec
>        -----------------
> 11.     2010     15-Dec
> 12.     2010     14-Dec
> 13.     2010     13-Dec
> 14.     2010     10-Dec
> 15.     2010     09-Dec
>        -----------------
> 16.     2010     08-Dec
> 17.     2010     07-Dec
> 18.     2010     06-Dec
> 19.     2010     03-Dec
> 20.     2010     02-Dec
>        +-----------------+
>

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