is a commercial
package developed by the Stata corporation in the USA for
statistics, graphics and data management. It is widely used
by academics especially in medical research and particularly
in epidemiology. It is continuing developing, and new
versions are released every one or two years. The exemplars
have all been developed using Stata Version 8.1, but are now
being updated to Stata 9. Exemplar 1 is complete. Version 8
code is still available.
Version 9 was released in May 2005.
Although it announces that it has many new survey features,
some of these are availbale to survey 8 users via contributed
libraries. The major additions to the survey routines are
analysis via replication and methods for post-stratification . Replication
methods are available in the version 8 library contributed by
Nick Winter (see D.5 below). This library also allows
poststratification to more than one set of population totals
by raking. These routines are used for exemplar 1.
More details of Version 8 to 9 changes are in section
To help you get started with Stata we have developed some
guides to go with each exemplar.
Mini-guides are intended as reminders for people with some
experience with Stata.
Novice guides are intended to give non-Stata users the basic
help they need to analyse surveys: novice guide