Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: RE: Creating repeated index
From
TA Stat <[email protected]>
To
[email protected]
Subject
Re: st: RE: Creating repeated index
Date
Wed, 20 Oct 2010 23:26:51 +0700
Thanks a lot, it works this time.
Pete
On Wed, Oct 20, 2010 at 11:04 PM, Nick Cox <[email protected]> wrote:
> Try
>
> bysort studentid visitdate : gen first = _n == 1
> by studentid : replace first = sum(first)
>
> Nick
> [email protected]
>
> Pete
>
> It doesn't work. The index should start with "1" for every student.
>
> On Wed, Oct 20, 2010 at 10:36 PM, Nick Cox <[email protected]> wrote:
>> egen index = group(studentid visitdate)
>>
>> Nick
>> [email protected]
>>
>> Pete
>>
>> I am trying to create an index/running number based upon same value of
>> one variable, i.e., visit date. Different visit date will have
>> different index/running number. I can do it by finding duplicates and
>> drop them, then create an index and save as a new file, then merge a
>> new file with the original one. However, I want to know whether there
>> is a short cut to do this. My data will looks like this.
>>
>> StudentID Visit Date Item Index
>> 1 1/1/2010 A 1
>> 1 1/1/2010 B 1
>> 1 2/4/2010 A 2
>> 1 2/4/2010 B 2
>> 1 2/4/2010 C 2
>> 2 4/1/2010 A 1
>> 2 4/1/2010 B 1
>> 2 4/1/2010 C 1
>> 2 3/3/2010 A 2
>> 2 3/3/2010 E 2
>>
>>
>> *
>> * 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/
>>
>
> *
> * 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/
>
> *
> * 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/
>
*
* 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/