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RE: st: generating age using dates
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
RE: st: generating age using dates
Date
Fri, 17 Dec 2010 17:02:24 +0000
These ages are evidently all near 50. That suggests to me some confusion directly or indirectly to do with the fact that Stata's origin for dates is 1 January 1960, i.e. nearly 50 years ago. Just a wild guess.
We have to see what
Nick
[email protected]
martine etienne
"very similar" looks like this:
tab age
age | Freq. Percent Cum.
------------+-----------------------------------
49.85495 | 1 0.35 0.35
49.86043 | 1 0.35 0.70
49.86864 | 1 0.35 1.05
49.87685 | 1 0.35 1.39
49.89053 | 2 0.70 2.09
49.90421 | 1 0.35 2.44
49.90695 | 1 0.35 2.79
49.91516 | 2 0.70 3.48
49.92337 | 2 0.70 4.18
49.92611 | 1 0.35 4.53
49.93705 | 2 0.70 5.23
49.93979 | 1 0.35 5.57
49.94253 | 1 0.35 5.92
49.94527 | 3 1.05 6.97
49.948 | 1 0.35 7.32
49.95348 | 1 0.35 7.67
please see the output of
des nage age
storage display value
variable name type format label variable label
----------------------------------------------------------------------------------------------------------------------
nage float %9.0g
age float %9.0g
The survey was administered to a random selection of patients, and our patient
population is between 20-60years old.
From: Neil Shephard <[email protected]>
On Fri, Dec 17, 2010 at 3:26 PM, martine etienne <[email protected]> wrote:
> I am trying to generate age using the following variables:
>
> "survey_date"=survey date
>
> "q1_dob2"=date of birth
What format are these stored as?
-des survey_date q1_dob2-
>
> I started with the following command:
> gen nage= survey_date- q1_dob2
> gen age= nage/365.4
> but I'm stuck at this point because it looks like the numbers are very similar
> to each other,
What does "very similar" mean? If you could post the output of -des
nage age- would go some way to explaining that.
> ie..I have a sample of 287 and over 200 are 50 plus....
Why is that surprising? What is the study design? If it was to
survey people > ~45 then this wouldn't surprise me at all!
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