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

Stata 11 Sample Session Section 3 – Tables and other Types of Analysis
The count command
The recode command
The egen command
To answer this question you can count the number of times the
value of 1 appears in the variable associated with maize. To
count the number of times a value appears in the variable. The
command is count
count if h64a == 1
In the Results window you see the value of 86. You could also
run a frequencies:
tabulate h64a
The tabulate shows that 147 did not increase sales of maize as
well as 86 households who did. Now we change the question.
B. How many crops increased in sales within the household?
For this question we can sum the number of 1's in the variables
associated with this question using the egen command. We
need to recode the value of 2 to 0.
Recode:
1. Select Create or change variables from the Data
menu
2. Select Other variable transformation commands
then Recode categorical variable
The recode - Recode categorical variable dialog
box opens.
3. Under the Main tab, click in the Variables box and
select all the variables that start with h64, e.g. h64a
h64b h64c h64d h64e h64f h64g h64h
4. In the box for Required: type
(2=0)
3. Click on the copy button, switch to the do-file editor,
paste the command, switch back to the dialog box and
click on Ok.
The Stata command is:
recode h64a h64b h64c h64d h64e h64f h64g h64h (2=0)
The values in the h64x variables are either 0=no or 1=yes. We
are ready to count the number of crops that increased in sales:
1. Select Create or change variables from the Data
menu
2. Select Create new variable (extended)
The egen - Extensions to generate dialog box
opens.
3. Under the Main tab, type the name of the new variable in
the Generate Variable box: ncrops
95