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st: Merge two data sets


From   "Vimalanand S. Prabhu" <prabhu@unc.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Merge two data sets
Date   Fri, 18 Apr 2003 15:30:08 -0400

Dear Friends

I have following two datasets

Dataset 1 with 2 rows
Data set 2 with 5 rows
I want the resultant dataset to be 2x5 = 10 rows for the household


Data set 1.

OBVS1ID HHID  PersonID  PersonCharacteristcis
25                   1            1
26                   1            2                .....Matrix(X1)

Data set 2 (from Census)
OBVS2ID HHID    PersonID    Person&other_characteristics
A21            1            1
A22            1            2
A23            1            3                      .....Matrix(X2)
A24            1            4
A25            1            5

Resultant data set

OBVS1ID    OBVS2ID     HHID   PersonID1    PersonID2  Person_charac
Person& other charac
25                    A21            1            1                    1
25                    A22            1            1                    2
25                    A23            1            1                    3
25                    A24            1            1                    4
25                    A25            1            1                    5
26                    A21            1            2                    1
26                    A22            1            2                    2
26                    A23            1            2                    3
26                    A24            1            2                    4
26                    A25            1            2                    5






----- Original Message -----
From: "Scott Merryman" <smerryman@kc.rr.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Thursday, April 17, 2003 10:32 PM
Subject: st: Re: SUR on stacked data


> ----- Original Message -----
> From: "Vimalanand S. Prabhu" <prabhu@unc.edu>
> To: <statalist@hsphsun2.harvard.edu>
> Sent: Wednesday, April 16, 2003 11:01 PM
> Subject: st: SUR on stacked data
>
>
> > Dear Friends,
> >
> > I have data stacked into columns. I want to conduct a SUR on this data
> where
> >
> > Y1 = f(x1)
> > Y2= f(x2)
> > where y1, x1 and y2, x2 are variables for different gender.
> > Note that both Xs are not same (else SUR is algebriacally equivalent to
> > OLS).
> >
> > Do you  know how to convert a stacked dataset into a formal where I can
> > directly use "sureg" command for SUR model?
> >
> > Thanks,
> >
> > Prabhu
> >
>
> Prabhu,
>
> I believe the following little program will work.  It creates a series of
> new variables for each group beginning at the same observation number as
the
> first group.
>
> Example:
>
> use http://www.stata-press.com/data/r8/grunfeld.dta
> separate2 invest mvalue kstock, group(company)
>
> and then
>  sureg (invest1 mvalue1 kstock1) (invest2 mvalue2 kstock2) ....
>
>
> I hope this helps,
> Scott
>
>
> -----start of separate2.ado-----
> program separate2
> version 8.0
>
> syntax varlist, group(varname)
>
> tempname Vals /*Pilfered from Nick Cox's -levels- */
>  qui tab `group' , matrow(`Vals')
>  local nvals = r(r) -1
>  local sep " "
>  forval i = 1 / `nvals' {
>      local val = `Vals'[`i',1]
>      if `i' < `nvals' local vals "`vals'`val'`sep'"
>     else local vals "`vals'`val'"
>     }
> local levels `"`vals'"'
>
> qui sum `group'
> local min = r(min)
>
> foreach var of varlist `varlist' {
>  local i = `min'
>  local num = 0
>  separate `var', by(`group')
>  foreach x of local levels {
>   qui sum `var'`i'
>   local num = `num' + r(N)
>   local i = `i' + 1
>   replace `var'`i' = `var'`i'[_n+`num']
>   }
>  }
>
> end
>
>
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