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Re: st: data management - days into weeks


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: data management - days into weeks
Date   Wed, 7 Mar 2012 07:45:08 +0000

Or

gen week = ceil(day/7)

See also

SJ-3-4  dm0002  . . . . . . . . Stata tip 2: Building with floors and ceilings
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
        Q4/03   SJ 3(4):446--447                                 (no commands)
        tips for using floor() and ceil()


which is freely accessible to all. -search ceil- in Stata to get a
clickable link.

Nick

On Tue, Mar 6, 2012 at 11:57 PM, Phil Clayton
<philclayton@internode.on.net> wrote:

> How about:
> gen week=trunc((day-1)/7) + 1

On 07/03/2012, at 10:48 AM, Maria Cecilia Vieira da Silva wrote:

>> In my data set I have "day", a variable that indicates the day of treatment of a patient. Example:
>>
>> Patient=1
>>
>> Day=5
>> Outcome x1=6
>> Outcome x2=0.5
>>
>> Day=10
>> Outcome x1=5
>> Outcome x2=0.6
>>
>> I would like to create a variable "week", where week=1 if day<=7; week=2 if 7<day<=14 and so on.
>> Any suggestion about how to create "week" without my having to write the conditions for each week of the year up to week 52?
>> The date functions do not help me because my data set does not contain 'dates'.
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