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

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Stata 11 Sample Session Section 2 – Restructuring Data Files – Table Lookup & Aggregation *open log file capture log close log using log_session2, append The Do-file editor window will open. 2. Click on the yellow file folder tool and select the file session2.do 3. Click on Open You can then re-execute these same commands or edit them as you wish. There are 2 icons on the tool bar: and . You can block lines in the do-file and click on either of these icons. The first icon (“Run Selected LInes” the commands you’ve blocked but in the Results ) runs window you do not see the commands or any output from analysis. The second icon (“Do Selected Lines” runs the commands you’ve blocked and in the Results ) window you can see which commands were run as well as the output from any analysis. Your SESSION2.DO should look similar to lines below; your documentation comments may not match exactly what has been included in this listing. Comments start with “/*” at the beginning of each comment and ending each comment with a */. You can also just use an “*” if the command is one line. /*STATA do file – section 2 – Cross-sectional Stata Tutorial Purpose: Calculate food production in calories per adult equivalent per day M Beaver - January 2009 */ /* Tasks: 1) Compute total kgs produced, compute value of production in calories for specific food crops and aggregate to the household level to obtain total food calories produced 2) Compute adult equivalents and aggregate to the household level 3) Merge the two files and calculate food production in calories per adult equivalent per day 4) Produce a table showing average food production in calories per adult equivalent in quartiles for each district */ /* Stata recommends you include the version that the do file was written in */ version 11 clear all macro drop _all *modify next command to match the directory you are using cd "C:\Documents and Settings\aec_user\My Documents\StataTraining\data" * turn off "more" so the whole file will run set more off ************************************ *Step 1 ************************************ 82
Stata 11 Sample Session Section 2 – Restructuring Data Files – Table Lookup & Aggregation /* open production data file */ use "c-q4.dta", clear /* sort variables to match by to merge in the conversion value to convert to kgs */ sort prod p1a tab1 prod p1a /* rename the p1a variable to unit to match the conver data file */ rename p1a unit joinby prod unit using "conver.dta", unmatched( master ) _merge(_merge) *check to be sure merge done correctly tab1 _merge /* check to see if got what was expected using list command */ list prod unit conver if prod==47 & unit ==8 * calculate kgs produced generate double qprod_tt= p1b * conver /* merge in the lookup conversion value for calories and calculate total calories */ drop _merge joinby prod using "calories.dta", unmatched( master ) _merge(_merge) *check to be sure merge done correctly tab1 _merge *compute total calories produced generate double cprod_tt= qprod_tt * calories /* add variable labels */ label variable qprod_tt "Total production in kgs" label variable cprod_tt "Total calories produced" /* select only staple crops */ keep if prod == 5 | prod == 6 | prod == 30 | prod == 31 | prod == 41 | prod ==44 | prod == 47 /* check to see that there are only 7 crops listed */ tabulate prod /* need to sum all calories produced by the household Using the collapse command*/ collapse (sum) cprod_tt, by(district vil hh) label variable cprod_tt "Calories produced in staple foods" describe /* verify you have the right average calories produced over whole sample */ summarize cprod_tt /* save the file */ 83
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STATA 11 for Windows SAMPLE SESSION - Food Security Group ...

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