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

Stata 11 Sample Session Section 4 – Tables and Graphs, Survey estimation
strata. Strata are considered to be statistically independent and
can be analyzed as such.
A weight has already been calculated for each household. The
variable which contains this value is called hhwgt.
We need to compute the cluster variable. We can use dist for
the strata variable since it already contains the province value
as part of the district code.
Close the browser and use the gen command to create the
variable “cluster1”.
To be able to use the survey commands, we must first
define the stratified random sampling method that was used to
account for weighting, clustering and stratification. We will
use the svyset command to specify the method.
1. Click on Statistics then Survey data analysis
2. Then click on Setup & utilities then Declare
survey design for dataset
3. In the Primary sampling unit: box select cluster1
4. In the Strata: box select dist
5. Click on the Weights tab
6. Click on the radio button next to Sampling Weight
Variable.
7. Click on the drop-down arrow for the Sampling
weight variable: box and select hhwgt
8. 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:
svyset cluster1 [pweight=hhwgt], strata(dist)
vce(linearized) singleunit(missing)
After running the command we see a summary of the
command in the Results window:
pweight: hhwgt
VCE: linearized
Single unit: missing
Strata 1: dist
SU 1: cluster1
FPC 1:
We can use the syvdesc command to look at the strata and
PSU arrangement of the dataset.
1. Click on Statistics then Survey data analysis
2. Then click on Setup & utilities then Describe
survey data
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