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Re: st: RE: dates


From   Steven Samuels <[email protected]>
To   [email protected]
Subject   Re: st: RE: dates
Date   Thu, 6 Oct 2011 18:50:29 -0400

With enough missing dates  it might be better to randomly assign a day of the month, or you risk distorting the distribution of inter-visit intervals. 

Steve


*********************************
clear
input str10 date
200801
20080113
end
set seed 21932
gen visdate = date(date, "YMD")
tempvar day
gen str2 `day' = string(ceil(15*runiform())) if length(date)==6
replace `day' = "0"+`day' if real(`day')<10
gen fakeday = (length(date)==6)
replace visdate = date(date + `day', "YMD") if length(date)==6
format visdate %td
list date visdate fakeday
*****************************



On Oct 6, 2011, at 5:46 PM, Michael Eisenberg wrote:

Thanks so much.

On Thu, Oct 6, 2011 at 8:23 AM, Nick Cox <[email protected]> wrote:
> You don't say what "without success" means precisely.
> 
> "200801" does not match either date pattern. If there is no information on day of month, Stata can only return missing for a daily date.
> 
> -date("200801" + "15", "YMD")- seems to be the most common fudge. I would always tag such guessed dates with an indicator variable.
> 
> Nick
> [email protected]
> 
> Michael Eisenberg
> 
> I have a list of visit dates for patients.  Unfortunately, the format
> is not constant.
> 
> Most are listed with the year, month, day such as 20080105 for Jan 5,
> 2008 but some are listed only with the year and month 200801 for Jan
> 2008.
> 
> I attempted to convert them into stata dates with the commands below
> without success.
> 
> gen ndate = date(dx_date, "YMD")
> or
> gen ndate = date(dx_date, "CCYYNNDD")
> 
> Can stata handle such inconsistent data?
> 
> 
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