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st: RE: weird date format


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: weird date format
Date   Mon, 21 Nov 2005 15:51:48 -0000

A regression of dob on birth gives a slope of -364, 
so that underlines the easy guess that dob is #days
since some origin. So the question is clearly what
origin. Some monkeying around gives 

. di mdy(1,1,1994) -  mdy(10,15,1582)
150193

So my wild guess is that the scale is "number 
of days since the Gregorian calendar was 
introduced on 15 October 1582". 

Nick 
n.j.cox@durham.ac.uk 

Haidong Wang
 
> I'm using a dataset with a format of date of birth (dob) which I can't
> recognize.
> 
> 
>      +--------------+
>      |    dob       age |
>      |--------------|
>   1. | 141116    27 |
>   2. | 141016    27 |
>   3. | 150189     2 |
>   4. | 125494    70 |
>   5. | 126759    66 |
>      +--------------+
> The survey was carried out between 1996 and 1997. So, the first
> respondents who's date of
> birth was "141116"  was 27 years old at that time, either 
> 1996 or 1997.
> 
> Does anyone know what format of date are those?

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