BAUM's A Little Bit Of Stata Programming Goes A Long Way PDF

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Extra info for A Little Bit Of Stata Programming Goes A Long Way

Sample text

The local macro tgt is used to store the “target” of the command, and used later to display the variable of interest (and the returned local macro r(var)). We place the if ‘touse’ qualifier on the [R] generate statement, and [P] capture the result of that statement to catch any errors: for instance, an attempt to use a function not known to Stata. The rc (return code) is tested for a non-zero value, which will signify an error in the [R] generate command. Exhibit 24 . capture program drop semean .

17. quietly summarize ‘target’ 18. scalar semean = r(sd)/sqrt(r(N)) 19. if ("‘print’" ~= "noprint") { 20. E. = " semean 21. } 22. return scalar semean = semean 23. return scalar mean = r(mean) 24. return scalar N = r(N) 25. return local var ‘tgt’ 26. end . E. 49627295 . E. 05576835 31 . E. 11333991 . 1133399069800714 macros: r(var) : "log(emp)" . E. 39944652 . emp is only defined for positive changes in employment, and most of the 140 firms in this sample suffered declines in employment in 1982.

If "‘function’" == "" { 6. local tgt "‘varlist’" 7. } 8. else { 9. local tgt "‘function’(‘varlist’)" 10. } 11. capture tsset 12. capture gen double ‘target’ = ‘tgt’ if ‘touse’ 13. if _rc > 0 { 14. di as err "Error: bad function ‘tgt’" 15. error 198 16. } 17. quietly summarize ‘target’ 18. scalar semean = r(sd)/sqrt(r(N)) 19. if ("‘print’" ~= "noprint") { 20. E. = " semean 21. } 22. return scalar semean = semean 23. return scalar mean = r(mean) 24. return scalar N = r(N) 25. return local var ‘tgt’ 26.

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A Little Bit Of Stata Programming Goes A Long Way by BAUM


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