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

Stata 11 Sample Session Section 2 – Restructuring Data Files – Table Lookup & Aggregation
check for number of districts */
tabulate district
/* there are 3 districts so we want to loop 3 times */
*first method.
for z in num 1/3: xtile quartz=cprod_ae if district == z, nq(4)
/*initialize variable */
gen quart=.
/*replace values with information from temporary variable */
for z in num 1/3: replace quart=quartz if district==z
for z in num 1/3: drop quartz
/* check results - should see equal number of cases in each category */
tabulate quart district
*second method.
drop quart.
*second method to create the quartile variables
*the following stores those numbers into local variables
levelsof district, local(levels)
foreach z of local levels {
xtile quartile`z' = cprod_ae if (district==`z'), nquantiles(4)
}
*create a new variable
generate quart = .
*replace values from quartile1, quartile2, quartile3 into quart
levelsof district, local(levels)
foreach z of local levels {
replace quart= quartile`z' if district == `z'
}
/*delete the 3 extra variables */
levelsof district, local(levels)
foreach z of local levels {
drop quartile`z'
}
tabulate quart district
label variable quart "Calorie production quartile"
/* produce the table */
by district quart sort: summarize cprod_ae
/* sort file by key variables */
sort district vil hh
save "hh-file3.dta", replace
*close log file
log close
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