Which suggest an easy way to convert your format to Stata date format (with all the pretty labelling options etc.):
gen dob2 = dob + mdy(10,15,1582)
format dob2 %d
list
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z214
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Nick Cox
Sent: maandag 21 november 2005 16:52
To: [email protected]
Subject: st: RE: weird date format
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
[email protected]
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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