Re: st: RE: problem with -collapse- [was: ]

[Nick Cox <njcoxstata@gmail.com>]

Try this

contract *
list
reshape wide _freq , i(year month) j(type) string
renpfix _freq
list
mvencode * , mv(0)
list

That said, my wild guess is that the -reshape- may cause more problems
than it solves. Also, watch out for characters in -type- that can't
appear in variable names.


Nick
njcoxstata@gmail.com


On 19 August 2013 19:53, HAKAN USLU <hakan_uslu84@hotmail.com> wrote:
>> Hello all,
>> I am having a problem with -collapse (count)-
>> Can someone help me to convert (collapsing and counting) my data as
>> follows? ;
>>
>> My data looks like this:
>> year month type
>> 2010 1      a
>> 2010 1      a
>> 2010 1      b
>> 2011 1      b
>> 2012 3      b
>> 2010 1      c
>> 2011 4      c
>> 2011 4      c
>> 2011 4      c
>> 2010 2      c
>> 2012 5      c
>> 2012 5      c
>>
>
>> I need data that looks like this:
>>
>> year month a b c
>> 2010 1     2 1 1
>> 2010 2     0 0 1
>> 2011 1     0 1 0
>> 2011 4     0 0 3
>> 2012 3     0 0 0
>> 2012 5     0 0 2
>>
>>
>> Basically, I try to collapse and count my data with respect to month
>> and year. I have 800 different numeric characters in the variable
>> namely 'type'. I want to convert each character to a new variable. I
>> use Stata 11.0. I already tried the following loop but I got unexpected
>> error message like 'type mismatch' or 'no observations'.
>>
>> foreach c in 1/800 {
>> preserve
>> keep if type == `c'
>> collapse (count) type, by (month year)
>> ren type `c'
>> save `c', replace
>> restore
>> }
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