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st: program to calculate specific percentiles


From   Dirk Nachbar <Dirk.Nachbar@dwp.gsi.gov.uk>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: program to calculate specific percentiles
Date   19 Jul 2006 15:43:20 +0100

All

here is a program to calculate specific percentiles. unfortunately it reports a syntax error and I don't know why.

capture program drop perc

program define perc

    version 8.2

    syntax varlist [if] [in], [by(name)] groups(int 10) gen(name)

    marksample touse

    qui count if `touse'

    if r(N) ==0 {

            error 2000

            }

    if `groups'>100 | `groups'<1     {

            di as error "there must be between 1 and 100 groups"

            exit 198

            }

   

qui    {

    tempvar rank nomiss count

    if `by' != "" {

            bysort `by': egen rank=rank(`1')

            bysort `by': gen nomiss=(`1' != .)

            bysort `by': egen count=sum(nomiss)

            bysort `by': gen `gen'=rank/count*`groups'

            }

    else {

            egen rank=rank(`1')

            gen nomiss=(`1' != .)

            egen count=sum(nomiss)

            gen `gen'=rank/count*`groups'

            }

    }

    di "the variable " `gen' " was created"

end

Dirk Nachbar

Assistant Economist

Pensim2

Department for Work and Pensions

Level 4, The Adelphi

1-11 John Adam St

WC2N 6HT London

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