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From |
Nick Cox <n.j.cox@durham.ac.uk> |

To |
"'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |

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 n.j.cox@durham.ac.uk 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 <nshephard@gmail.com> On Fri, Dec 17, 2010 at 3:26 PM, martine etienne <martieluvsu@yahoo.com> 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! * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: generating age using dates***From:*martine etienne <martieluvsu@yahoo.com>

**Re: st: generating age using dates***From:*Neil Shephard <nshephard@gmail.com>

**Re: st: generating age using dates***From:*martine etienne <martieluvsu@yahoo.com>

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