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Re: st: Count the number of changing string values
From
Ching Wong <[email protected]>
To
[email protected]
Subject
Re: st: Count the number of changing string values
Date
Fri, 14 Jun 2013 21:33:40 +0930
The long dataset is as follows:
id sex year drug
1 F 1999 Yes
1 F 2000 No
1 F 2001 Yes
1 F 2002 .
3 M 1999 No
3 M 2000 Yes
3 M 2001 Yes
3 M 2002 No
5 F 1999 Yes
5 F 2000 Yes
5 F 2001 Yes
5 F 2002 Yes
10 M 1999 Yes
10 M 2000 No
10 M 2001 Yes
10 M 2002 No
Thanks.
Ching
On 14 June 2013 21:20, Nick Cox <[email protected]> wrote:
> Fine. If you tell me what your data are once -reshape-d I will advise.
>
> Nick
> [email protected]
>
>
> On 14 June 2013 12:45, Ching Wong <[email protected]> wrote:
>> Hi Nick,
>>
>> I would like to count "how many times a user said Yes one year and No the next".
>>
>> Thanks.
>>
>> Ching
>>
>> On 14 June 2013 21:11, Nick Cox <[email protected]> wrote:
>>> I take this to be a new question, but I am unclear what you want. Do you want
>>>
>>> 1. Counting how many times a user said Yes one year and No the next?
>>>
>>> 2. Identifying the first year in which a user said Yes after
>>> previously saying No.
>>>
>>> I fall back on emphasising my previous advice
>>>
>>> Long structure ... is likely to be better for you for most analyses.
>>>
>>> Get these data -reshape-d. You are going to want to do lots of
>>> analyses on different kinds of patterns, and keeping this structure is
>>> really going to strain any user's Stata fluency.
>>>
>>> Nick
>>> [email protected]
>>>
>>>
>>> On 14 June 2013 12:12, Ching Wong <[email protected]> wrote:
>>>> Thanks Nick
>>>>
>>>> Yes, it's all good if I only need to count the first "NO'.
>>>>
>>>> But I would rather to see how to count the first "YES & NO" between
>>>> year of study.
>>>>
>>>> id Drug2009 Drug 2000
>>>> 1 Yes NO ------->ONE count
>>>>
>>>> Regards,
>>>>
>>>> Ching
>>>>
>>>> On 14 June 2013 20:24, Nick Cox <[email protected]> wrote:
>>>>> I can't see your value labels from here. But suppose that "No" is a
>>>>> label for value 1.
>>>>>
>>>>> replace year = `j' if Drug`j' == 1 & missing(year)
>>>>>
>>>>> I trust that you will be able to modify that to your situation.
>>>>>
>>>>>
>>>>> Nick
>>>>> [email protected]
>>>>>
>>>>>
>>>>> On 14 June 2013 11:45, Ching Wong <[email protected]> wrote:
>>>>>> Hi Nick,
>>>>>>
>>>>>> So what if -drug*- are numeric variables with value labels, how should
>>>>>> I change my Command?
>>>>>>
>>>>>>
>>>>>> Thanks!
>>>>>>
>>>>>>
>>>>>> Ching
>>>>>>
>>>>>> On 14 June 2013 19:19, Nick Cox <[email protected]> wrote:
>>>>>>> Code that "doesn't work" but is not shown can not be commented on.
>>>>>>> Long structure (I prefer to avoid the word "format" here) is not
>>>>>>> essential for the problem as I understand it, but it is likely to be
>>>>>>> better for you for most analyses.
>>>>>>>
>>>>>>> The year in which people first said "No" is
>>>>>>>
>>>>>>> gen year = .
>>>>>>>
>>>>>>> qui forval j = 1999/2012 {
>>>>>>> replace year = `j' if Drug`j' == "No" & missing(year)
>>>>>>> }
>>>>>>>
>>>>>>> tab year
>>>>>>>
>>>>>>> So,
>>>>>>>
>>>>>>> 1. Everybody starts out with missing.
>>>>>>>
>>>>>>> 2. If they said "No" in 1999, -year- is changed to 1999
>>>>>>>
>>>>>>> 3. If they said "No" in 2000, -year- is changed to 2000, but only if
>>>>>>> -year- is missing (so values of 1999 are protected)
>>>>>>>
>>>>>>> and so on.
>>>>>>>
>>>>>>> You didn't explain your datatypes. If -drug*- are numeric variables
>>>>>>> with value labels, the syntax will differ accordingly.
>>>>>>>
>>>>>>> Nick
>>>>>>> [email protected]
>>>>>>>
>>>>>>>
>>>>>>> On 14 June 2013 10:20, Ching Wong <[email protected]> wrote:
>>>>>>>
>>>>>>>> I have the following data set:
>>>>>>>>
>>>>>>>> Id sex drug1999 drug2000 drug2001 drug 2001
>>>>>>>>
>>>>>>>> 1 F Yes No Yes Unknown
>>>>>>>>
>>>>>>>> 3 M No Yes Yes No
>>>>>>>>
>>>>>>>> 5 F Yes Yes Yes Yes
>>>>>>>>
>>>>>>>> 9 M Unknown Yes No Yes
>>>>>>>>
>>>>>>>> 10 F Yes No Yes No
>>>>>>>>
>>>>>>>> I would like to produce a count of to show the number of people who
>>>>>>>> quit each year, only count the first time they quit and do not care if
>>>>>>>> they change their status to ‘No’ again.
>>>>>>>>
>>>>>>>> What would be the command? I tried to change it to the long formal and
>>>>>>>> use the lag function, but it doesn’t work.
>>>>>>>
>>>>>>> *
>>>>>>> * For searches and help try:
>>>>>>> * http://www.stata.com/help.cgi?search
>>>>>>> * http://www.stata.com/support/faqs/resources/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/faqs/resources/statalist-faq/
>>>>>> * http://www.ats.ucla.edu/stat/stata/
>>>>>
>>>>> *
>>>>> * For searches and help try:
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>>>>> * http://www.ats.ucla.edu/stat/stata/
>>>>
>>>> *
>>>> * For searches and help try:
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>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/
>>>> * http://www.ats.ucla.edu/stat/stata/
>>>
>>> *
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>>
>> *
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>
> *
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