STATA 11 for Windows SAMPLE SESSION - Food Security Group ...

Stata 11 Sample Session Section 2 – Restructuring Data Files – Table Lookup & Aggregation
save "hh-file1.dta", replace
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*Step 2
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/* calculating adult equivalents based on age and gender */
use "c-q1a.dta", clear
generate byte ae= 1 if ca4 == 1 & ca3 >=10
replace ae = .84 if ca4==2 & ca3 >=10 & ca3 =20
replace ae = .6 if ca3 < 10
label variable ae "Adult equivalents"
/* check the variable */
tabulate ae, missing
/* calculate mean to determine average ae across the whole population
To fill in the missing values*/
summarize ae
/* replace all system missing with the value of .79 */
replace ae = .79 if ae==.
tabulate ae, missing
/* need to sum the adult equivalents for each household */
collapse (sum) ae, by(district vil hh)
label variable ae "Adult equivalents per household"
summarize ae
* save file for later use */
save "hh-file2.dta", replace
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*Step 3
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use "hh-file2.dta", clear
/* now combine both the hh-file1 with hh-file2 , both files are already sorted by key variables
match files by district vil hh */
merge 1:1 district vil hh using "hh-file1.dta"
*check to see which file the variables are coming from
tab _merge
*3 = variables came from both files
drop _merge
/* calculate the calories per adult equivalent per day */
generate double cprod_ae= cprod_tt/ae/365
label variable cprod_ae "Calories per adult equivalent per day"
sum cprod_ae
/* rank the new variable by district into quartiles
84