**[SVY] survey** -- Introduction to survey commands

__Description__

Stata's facilities for survey data are centered around the **svy** prefix
command. This overview organizes and presents the commands conceptually,
that is, according to the similarities in the functions that they
perform.

**Survey design tools**

**[SVY] svyset** Declare survey design for dataset
**[SVY] svydescribe** Describe survey data

**Survey data analysis tools**

**[SVY] svy** The survey prefix command
**[SVY] svy estimation** Estimation commands for survey data
**[SVY] svy: tabulate oneway** One-way tables for survey data
**[SVY] svy: tabulate twoway** Two-way tables for survey data
**[SVY] svy postestimation** Postestimation tools for svy
**[SVY] estat** Postestimation statistics for survey
data, such as design effects
**[SVY] svy bootstrap** Bootstrap for survey data
**[SVY]** *bootstrap_options* More options for bootstrap variance
estimation
**[SVY] svy brr** Balanced repeated replication for survey
data
**[SVY]** *brr_options* More options for BRR variance estimation
**[SVY] svy jackknife** Jackknife estimation for survey data
**[SVY]** *jackknife_options* More options for jackknife variance
estimation
**[SVY] svy sdr** Successive difference replication for
survey data
**[SVY]** *sdr_options* More options for SDR variance estimation

**Survey data concepts**

**[SVY] variance estimation** Variance estimation for survey data
**[SVY] subpopulation estimation** Subpopulation estimation for survey data
**[SVY] calibration** Calibration for survey data
**[SVY] direct standardization** Direct standardization of means,
proportions, and ratios
**[SVY] poststratification** Poststratification for survey data

**Tools for programmers of new survey commands**

**[SVY] ml for svy** Maximum pseudolikelihood estimation for
survey data
**[SVY] svymarkout** Mark observation for exclusion on the
basis of survey characteristics

__Examples__

Setup
**. webuse multistage**

Declare the data to be complex survey data
**. svyset county [pw=sampwgt], strata(state) fpc(ncounties) || school,**
**fpc(nschools)**

Estimate the average weight of high school seniors in our population
**. svy: mean weight, over(sex)**

Test the hypothesis that the average male is 30 pounds heavier than the
average female
**. test [weight]male - [weight]female = 30**

__Video examples__

Basic introduction to the analysis of complex survey data in Stata

How to download, import, and merge multiple datasets from the NHANES
website

How to download, import, and prepare data from the NHANES website