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st: converting series of dates to numeric variable


From   loggyedr salvez <loggyedy@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: converting series of dates to numeric variable
Date   Wed, 23 May 2012 11:07:28 +0200

Dear all,

I have observations every 4 weeks (4-week period data).

In  the excel.csv file i format the cells for the date column as follows

           dates11                     identier            variable
  November 1, 2009                  1
November 29, 2009                  1
December 27, 2009                  1
January 31, 2010                     1
 November 1, 2009                   2
  November 29, 2009                  2
   December 27, 2009                2
   January 31, 2010                   2

and then I use the commads:

gen edate1 = date(dates11, "MDY")
format edate1  %d
 tsset identifier edate1



and I get the following stata message:

tsset identif2 edate1
       panel variable:  identif2 (strongly balanced)
        time variable:  edate1, 02nov2008 to 09oct2011, but with gaps
                delta:  1 day


Is this message something alarming? why "gaps"? and why delta "1 day"
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