Re: [SPAM] Re: st: sum the variable based on other variables

[Nick Cox <njcoxstata@gmail.com>]

Look at the help for -postfile-.

Something like

clear
input v1 v2 v3
1 1 0
0 0 1
1 0 1
1 1 1
0 1 0
1 1 1
end

tempname handle

postfile `handle' str32 which1 str32 which2 mean using myresults, replace

forv i=1/3 {
  forv j=1/3 {
  if `i'~=`j' {
    sum  v`i' if v`i' == v`j', meanonly
    post `handle' ("v`i'") ("v`j'") (`r(mean)')

}
}
}

postclose `handle'

use myresults, clear

Nick
njcoxstata@gmail.com


On 25 March 2014 09:58, wanhaiyou <wanhaiyou@hnu.edu.cn> wrote:
> Nick,thanks very much.
> In fact, I only need the mean.
> I attemp to save these value as a matrix.However,when the number of variable large,e.g.,100,
> the method is unfeasible.
> The following codes
> **
> clear
> input v1 v2 v3
> 1 1 0
> 0 0 1
> 1 0 1
> 1 1 1
> 0 1 0
> 1 1 1
> end
>
> forv i=1/3 {
>   forv j=1/3 {
>   if `i'~=`j' {
>     sum  c`i' if c`i'==c`j', meanonly
>         mat b=(nullmat(b)\r(mean))
> }
> }
> }
>
> How could I save those value (r(mean) from "sum"
> as a column?
>
>
> Bests,
> wanhaiyou
> Hunan University
>
>
>> -----原始邮件-----
>> 发件人: "Nick Cox" <njcoxstata@gmail.com>
>> 发送时间: 2014-03-25 17:01:06 (星期二)
>> 收件人: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
>> 抄送:
>> 主题: [SPAM] Re: st: sum the variable based on other variables
>>
>> You are using -egen- to create variables, each of which just holds a
>> constant. That is not necessary. The sum is left in memory as r(sum)
>> after -summarize-.
>>
>> I don't know what you want to do with your millions of sums, so this
>> code is only a start.
>>
>> forv i=1/3 {
>>   forv j=1/3 {
>>   if `i'~=`j' {
>>     sum  v`i' if v`i'==v`j', meanonly
>>     di r(sum)
>> }
>> }
>> }
>>
>> Nick
>> njcoxstata@gmail.com
>>
>> On 25 March 2014 04:19, wanhaiyou <wanhaiyou@hnu.edu.cn> wrote:
>>
>> > I want to creat the sum of one variable based on other variables.For example,
>> > I have the following dataset
>> > v1 v2 v3
>> > 1 1 0
>> > 0 0 1
>> > 1 0 1
>> > 1 1 1
>> > 0 1 1
>> > 0 1 0
>> >
>> > If v1=v2, then sum the corresponding value of v1
>> > v1 v2
>> > 1 1   equal
>> > 0 0   equal
>> > 1 0   not equal
>> > 1 1   equal
>> > 0 1   not equal
>> > 0 1   not equal
>> > if v1=v3, then sum the corresponding value of v1
>> > ....
>> >
>> > if v3==v1,then sum the corresponding value of v3
>> > if v3=v2,then sum the corresponging value of v3
>> >
>> > I have written the following codes
>> >
>> > forv i=1/3 {
>> >   forv j=1/3 {
>> >   if `i'~=`j' {
>> >   egen vsum`i'`j'=total(v`i') if v`i'==v`j'
>> > }
>> > }
>> > }
>> >
>> > However, I have 5000 variables but the max number of variables is 32,767.
>> > Therefore, this codes cannot be used.
>> *
>> *   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/
>
>
> --
> Bests,
>
> wanhaiyou
>
> Hunan University
>
>
> *
> *   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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