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

Stata 11 Sample Session Section 2 – Restructuring Data Files – Table Lookup & Aggregation
Calculate the total calories
produced per adult equivalent per
household for the year
1 = observation is from file in memory
2 = observation is from file on disk
3 = observations are from both files
It is very important to look at the values in this
variable after you have run the merge.
5. Click on the copy button, switch to the do-file
editor, paste the command, delete the directory
reference, switch back to the dialog box and click
on Ok.
6. In the do-file insert comments to remind you what
you’ve done.
The Stata command is:
Merge 1:1 district vil hh using "hh-file1.dta"
In the results window, you see a summary of the number
of observations not matched and matched.
Now that you have run the merge, run a tabulate on the
_merge variable. You can abbreviate the name to “_m”,
e.g. tabulate _m. You should see only the value of “3"
for 343 observations. That means that there was an
observation for each “district - vil - hh” combination in
each of the two files.
Merge Files created a new working data file. The two
variables you need to compute calories produced per
adult equivalent are now in the working file. Total
calories produced (cprod_tt) per household for the year
divided by total adult equivalents per household (ae)
divided by 365 days per year gives us calories produced
per adult equivalent per day (cprod_ae).
1. Select Data then Create or change variables then
from Create new variable
The generate - Create a new variable dialog box
opens.
2. If you see information in the dialog box, click on
the Reset icon to clear the contents.
3. Under the Main tab, type the name of the new
variable in the Generate Variable box:
cprod_ae
4. Change the Variable type to “double”.
5. For the Contents of new variable box, type in
cprod_tt/ae/365
6. Click on the copy button, switch to the do-file
editor, paste the command, switch back to the
dialog box and click on Ok.
7. Add a comment in the do-file to explain what you
have done.
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