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st: RE: RE: Change string to year and month date


From   "DeMichele, Matthew" <[email protected]>
To   <[email protected]>
Subject   st: RE: RE: Change string to year and month date
Date   Fri, 18 Oct 2013 11:27:59 -0400

I didn't really think about the underlying framework of dates stored in Stata. And, it might be that my needs can be met by simply extracting the year only (which I have done). I have a date of birth variable in which the day was removed for confidentiality reasons. I wanted to calculate age of admissions and exposure types of variables, but it seems best to just compute these as years of age. 

Thank you, Matthew 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Joe Canner
Sent: Friday, October 18, 2013 11:24 AM
To: [email protected]
Subject: st: RE: Change string to year and month date

Matthew,

A Stata date variable without a day doesn't make much sense, since a date variable is the number of days since 1/1/1960.  Please clarify what it is you intend to do with this variable so that we can give the best advice on how to proceed.

Regards,
Joe Canner

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of DeMichele, Matthew
Sent: Friday, October 18, 2013 11:16 AM
To: [email protected]
Subject: st: Change string to year and month date

I'm trying to create a date variable using only the year and the month from a string variable formatted as YYYYMM. For example, 200405 = May, 2004. I ran the syntax below, but this results in DAY appearing in the first two columns as "01" such that the example above would be 01May2004. 

gen DATE_OF_BIRTH3= date(DATE_OF_BIRTH2, "YM") format DATE_OF_BIRTH3 %td

thank you. Matthew 


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