- stratified designs;
- cluster sampling;
- unequal probabilities of selection (sampling weights);
- multiple stages of sampling, with stratification, clustering and finite population corrections at each stage;
- finite-population corrections can be calculated for simple random sampling without replacement of sampling units within strata.
- post-stratification and direct standardization;
- some designs with a single PSU per stratum

- Estimation of means, totals, ratios, and proportions.
- Linear regression, logistic regression, and probit; also, tobit, interval, censored, instrumental variables, multinomial logit, ordered logit and probit, and Poisson. Point estimates, associated standard errors, confidence intervals, and design effects for the full population or subpopulations are displayed. Auxiliary commands will display all this information for linear combinations (e.g., differences) of estimators, and conduct hypothesis tests.
- Contingency tables with Rao-Scott corrections of chi-squared tests; new survey-corrected regression commands including tobit, interval, censored, instrumental variables, multinomial logit, ordered logit and probit, and Poisson.

- Linearization estimator
- The jackknife (with either the set of weights specified by the user, or through direct calculation)
- BRR (with either the set of weights specified by the user, or with an Hadamard matrix specified by the user) with Fay corrections
- The bootstrap estimation can be performed with user add-ons (-bs4rw- command)
- The type of variance estimator can be specified as a design option (and thus saved with data), or requested at time of estimation
- Warnings are issued for strata with a single PSU or no PSUs in domain estimation. In the former case, the user can have standard errors calculated by treating singleton PSUs as selected with certainty, or by scaling variances from other strata, or reported as missing

- Windows (all current versions from 2000 to Vista; 32-bit and 64-bit Windows varieties for x86, x86-64, and Itanium);
- Power Macintosh (OS X 10.4 or later);
- Linux (any x86, x86-64, Intel Itanium, or compatible running Linux; 32-bit and 64-bit varieties; tested and supported operating systems include Red Hat 6.1 (or later), SuSE 9 (or later), Fedora Core 1 (or later), RHEL 4);
- Alpha AXP running Digital Unix;
- HP-9000 with HP-UX;
- IBM RS/6000 running AIX (32- and 64-bit varieties);
- SGI running Irix 6.5;
- Sun Solaris on 64-bit SPARC or 64-bit x86-64

Software is distributed as precompiled object program. Updates are distributed through http protocol; the minor updates include the script ("ado") and help files, and are usually issued once in two-three weeks; the major updates to the executable file are usually made approximately once in a quarter. The software checks the availability of updates on startup. Current version is Stata 10 (as of June 2007). Multiprocessor parallel processing version of Stata is available.

4905 Lakeway Drive

College Station, TX 77845

800-782-8272 (U.S.)

800-248-8272 (Canada)

979-696-4600 (Worldwide)

979-696-4601 (Fax)

E-mail:

`stata@stata.com`

Web site:

`http://www.stata.com`

This software is discussed in the review
article from *The Survey Statistician*.
Other relevanat Stata survey links:

- http://www.stata.com/support/faqs/stat/#survey
- http://www.stata.com/help.cgi?survey
- http://ideas.repec.org/s/boc/bocode.html
- http://www.ats.ucla.edu/stat/stata/topics/Survey.htm
- http://www.cpc.unc.edu/services/computer/presentations/statatutorial/example31.html