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

Stata 11 Sample Session Annex I I– Survey Instrument
hh animcode num
206 331 70
217 331 65
217 335 8
221 330 1200
221 331 200
The above file could have been organized such that each household has only one line of information, and
the three animal types appear as three different variables. Such a file would be the wide form of the data.
The file as it is organized now is the long form of the data.
The following reshape command converts the file from long to wide form such that each animal code is
now a variable, and the file becomes a household-level file.
. reshape wide num, i (hh) j (animcode)
. list, nol nod noo
hh num330 num331 num335
206 . 70 .
217 . 65 8
221 1200 200 .
When followed by this next command, the file is re-converted from wide to long. But note that the file
has become rectangularized, that is, the three animal codes now appear for each household.
. reshape long num, i (hh) j (animcode)
. list, nol nod noo
hh animcode num
206 330 .
206 331 70
206 335 .
217 330 .
217 331 65
217 335 8
221 330 1200
221 331 200
221 335 .
The command fillin would have also generated the same rectangularized file as in the preceding example.
Do-file suggested commands to place at the beginning of a do-file to set the parameters before starting to work:
1. Commands in a do-file may be delimited by a carriage return or a semi-colon. To set the semi-colon as
the delimiter, the command is:
#delimit ;
This command will only work in a do-file. The delimiter cannot be changed
from the console.
If you wish to revert back to the carriage return as the delimiter, the command is:
#delimit cr
2. The next command will clear the memory:
clear all;
3. There are several “set” commands that are useful to put at the beginning of the do-file as well.
set memory 70000; (sets the size of memory)
set matsize 100 ; (limits number of variables that can be specified in an estimation command)
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