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From |
Sanmitra Ghosh <sanmitraz@yahoo.co.uk> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Problem with "while" and "for" loops. |

Date |
Mon, 24 Jun 2002 12:26:55 +0100 (BST) |

Dear all, I am trying to calculate trend corrected coefficient of variation. But the do file is not running properly. I tried it using both while and for loops. The problem with the while loop is that if there is any missing value for the group variable, the do file terminates there giving a r(2000) message. This problem doesn't occur with the for loop, since there is a nostop option. However, it is giving another error message which is r(123), i.e. numlist has too many numbers. I don't know how to get rid of these problems. Could anyone kindly give me some suggestions? I am attaching the do files. Sincerely, Sanmitra Ghosh __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com

use "C:\WINDOWS\DESKTOP\temp.dta" sort stcode distcode time sum stdist local min = r(min) local max = r(max) gen trend1 = 0 local i = 1980 while `i' <= 1991 { local j = `i' - 1979 replace trend1 = `j' if time == `i' local i = `i' + 1} gen trend2 = 0 local i = 1992 while `i' <= 2000 { local j = `i' - 1991 replace trend2 = `j' if time == `i' local i = `i' + 1} gen period = 0 replace period = 1 if time >= 1992 gen adjrsq1 = 0 gen adjrsq2 = 0 local x = `min' while `x' <= `max'{ reg crop trend1 if (stdist == `x' & period == 0) replace adjrsq1 = e(r2_a) if (stdist == `x' & period == 0) reg crop trend2 if (stdist == `x' & period == 1) replace adjrsq2 = e(r2_a) if (stdist == `x' & period == 1) local x = `x' + 1} macro drop _min _max _i _j _x gen cov1 = sqrt(covarr1*(1 - adjrsq1*adjrsq1)) gen cov2 = sqrt(covarr2*(1 - adjrsq2*adjrsq2))

use "C:\WINDOWS\DESKTOP\temp.dta" sort stcode distcode time sum stdist local min = r(min) local max = r(max) gen trend1 = 0 local i = 1980 while `i' <= 1991 { local j = `i' - 1979 replace trend1 = `j' if time == `i' local i = `i' + 1} gen trend2 = 0 local i = 1992 while `i' <= 2000 { local j = `i' - 1991 replace trend2 = `j' if time == `i' local i = `i' + 1} gen period = 0 replace period = 1 if time >= 1992 gen adjrsq1 = 0 gen adjrsq2 = 0 for NUM in num `min'/`max', nos : reg crop trend1 if (stdist == NUM & period == 0) \replace adjrsq1 = e(r2_a) if (stdist == NUM & period == 0) \reg crop trend2 if (stdist == NUM & period == 1) \replace adjrsq2 = e(r2_a) if (stdist == NUM & period == 1) macro drop _min _max _i _j gen cov1 = sqrt(covarr1*(1 - adjrsq1*adjrsq1)) gen cov2 = sqrt(covarr2*(1 - adjrsq2*adjrsq2))

**Follow-Ups**:**st: RE: Problem with "while" and "for" loops.***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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