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Re: st: let loop stop when the first variable x becomes 0


From   Man Jia <jia.m@neu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: let loop stop when the first variable x becomes 0
Date   Thu, 19 Jun 2008 23:17:01 -0400 (EDT)

Hi Keith,

Thanks very much for your help! It works well.  I appreciate it.

Mandy


Keith Dear wrote:


>Oops - needs to be an "int" variable to hold years:
>gen int firstzero=.
>
>At 10:26 AM 20/06/2008, you wrote:
>>Mandy,
>>You could do it like this:
>>
>>gen byte firstzero=.
>>forval y=1995/2002 {
>>         replace firstzero=`y' if firstzero==. & x`y'==0
>>}
>>
>>Keith
>>
>>
>>
>>At 10:05 AM 20/06/2008, you wrote:
>>>Dear Statalists,
>>>
>>>I have a data set like this:
>>>-------------------------------------------------------------------
>>>ID,x1995, x1996, x1997, x1998, x1999, x2000, x2001, x2002
>>>
>>>  1   1         0          1          1       0          1          0
>>>   0
>>>  2   0         0          0          0       1          0         0
>>>   0
>>>  3   1         1          0          1       0          0         0
>>>   0
>>>---------------------------------------------------------------------
>>>I want to find out for each observation the first year when the value
>>>of the variable x becomes 0.
>>>
>>>For example, for observation 1, the first year x becomes 0 is 1996. For
>>>observation 2 and 3, 1995 and 1997 respectively.
>>>
>>>I'm not sure how to let the "searching the first 0" loop stop when x
>>>becomes 0. I checked STATA's help; I was wondering if the command
>>>"continue" will work here. Could someone give me some hints about this?
>>>
>>>Thanks a lot!
>>>
>>>Mandy Jia
>>>
>>>
>>>*
>>>*   For searches and help try:
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>>
>>
>>Dr Keith B.G. Dear
>>Senior Fellow in Biostatistics
>>National Centre for Epidemiology and Population Health
>>Australian National University
>>Canberra, ACT 0200, Australia
>>Tel: 02 612 54865, Fax: 02 612 50740
>>http://nceph.anu.edu.au/Staff_Students/staff_pages/dear.php
>>CRICOS provider #00120C
>>
>>http://canberragliding.org/
>>
>>*
>>*   For searches and help try:
>>*   http://www.stata.com/support/faqs/res/findit.html
>>*   http://www.stata.com/support/statalist/faq
>>*   http://www.ats.ucla.edu/stat/stata/
>
>
>Dr Keith B.G. Dear
>Senior Fellow in Biostatistics
>National Centre for Epidemiology and Population Health
>Australian National University
>Canberra, ACT 0200, Australia
>Tel: 02 612 54865, Fax: 02 612 50740
>http://nceph.anu.edu.au/Staff_Students/staff_pages/dear.php
>CRICOS provider #00120C
>
>http://canberragliding.org/
>
>*
>*   For searches and help try:
>*   http://www.stata.com/support/faqs/res/findit.html
>*   http://www.stata.com/support/statalist/faq
>*   http://www.ats.ucla.edu/stat/stata/
>
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



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