Hi Svend,
It still doesn't work. I programed in this way(variables name are
different in my dataset, so I still use you example for convenience)
//calculated total
forvalues i=4(11)386{
local j='i'+4
replace total=total+var'i'*var'j'
}
Then Stata 8.2 informs me
'i' invalid name
r(198)
If I need to define i before run the ado above? Thanks
Joe
On 10/9/05, Svend Juul <[email protected]> wrote:
> Xiangping wrote:
>
> There are hundreds of variables from var4 to v389. Now I have to -gen-
> total=var4*var8+var15*var19+var26*var30...............
> The step of one multiplied pair is 4. The step between the first
> variable of one pair and the variable in front of it is 7. Can someone
> give me a hint? Or which command or commands can be used here.
> -----------------------------------
>
> Use -foreach-; see [P] foreach. I had to start by creating an
> artificial dataset; you have your own data, of course.
>
> // create artificial data with 389 variables
> clear
> set obs 10
> forvalues I = 1/389 {
> gen var`I' = round(10*uniform())
> }
>
> // calculate -total-
> generate total=0
> forvalues I = 4(11)386 {
> local J = `I'+4
> replace total = total + var`I'*var`J'
> }
>
> Is that what you need?
>
> Svend
>
>
>
> ________________________________________________________
>
> Svend Juul
> Institut for Folkesundhed, Afdeling for Epidemiologi
> (Institute of Public Health, Department of Epidemiology)
> Vennelyst Boulevard 6
> DK-8000 Aarhus C, Denmark
> Phone, work: +45 8942 6090
> Phone, home: +45 8693 7796
> Fax: +45 8613 1580
> E-mail: [email protected]
> _________________________________________________________
>
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>
--
Xiangping JIA
*
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