Summary of survey software:
SAS Institute Inc.
Types of Designs That Can Be Accommodated
For the sample selection procedure, the sample design can be a complex
multistage sample design that includes stratification, clustering,
replication, and unequal probabilities of selection.
For survey data analysis procedures, the sample design can be a
complex survey sample design with stratification, clustering, unequal
weighting, and with or without replacement.
Types of Estimands and Statistical Analyses That Can Be Accommodated
SAS/STAT Software provides the SURVEYSELECT procedure for sample
selection and the SURVEYMEANS and SURVEYREG procedures for producing
descriptive statistics and regression estimates, respectively. These
three procedures are available in SAS versions 8 and higher. Beginning
with SAS 9, SAS/STAT also includes the SURVEYFREQ procedure for computing
crosstabulations and tests of association, and the SURVEYLOGISTIC
procedure for performing logistic regression. The analysis procedures
can accommodate complex survey designs that include stratification,
clustering, and unequal weighting.
- The SURVEYSELECT procedure provides a variety of methods for
selecting probability-based random samples. The procedure can select a
simple random sample, or samples with design features such as
stratification, clustering or multistage sampling, or unequal
probabilities of selection. It can accomodate very large sampling
frames. It can draw a replicated sampling, i.e. a sample composed of a
set of replicates, each selected in the same way.
PROC SURVEYSELECT accepts the sampling frame as a SAS data set.
Control language specifies the selection methods, the desired sample size
or sampling rate, and other parameters. The output data set contains
the selected units, with selection probabilities and sampling weights.
- The SURVEYMEANS procedure estimates population totals, means,
and ratios (SAS 8.2 and later), with estimates of their variances,
confidence limits, and other descriptive statistics, under sample
designs that may include stratification, clustering, and unequal
- The SURVEYREG procedure estimates regression coefficients by
generalized least squares, using elementwise regression, assuming that
the regression coefficients are the same across strata and PSUs.
- The SURVEYLOGISTIC procedure fits logistic regression models
for discrete response survey data by maximum likelihood, incorporating
the sample design into the analysis.
- The SURVEYFREQ procedure produces one-way to n-way frequency
and crosstabulation tables from sample survey data. These tables include
estimates of population totals, population proportions, and corresponding
standard errors. Confidence limits, coefficients of variation, and
design effects are also available, as are tests of independence (Wald test,
Rao-Scott likelihood ratio test, Rao-Scott chi-square test).
Restrictions on Number of Variables or Observations.
Primary Methods Used for Variance Estimation.
General Description of the "Feel" of the Software.
The interface is similar to other SAS procedures. Programs may be
entered from command files or through a windowing system. The Explorer
window is used to view and manage SAS files. The Program Editor is used
to enter, edit, and submit SAS programs, and messages appear in the Log
window. Output from SAS programs is viewed in the Output window and
navigate and managed in the Results window.
Platforms on which the Software Can Be Run.
Version 9.1 of the SAS System is available on the following platforms:
- Aix (64-bit), Release 5.1+
- HP/UX (64-bit), Release 11i+
- HP/UX Itanium (64-bit), Release 11i+
- Linux for Intel (32-bit): Red Hat 8.0, Advanced Server 2.1, SuSE SLES 8
- Linux for Itanium (64-bit): Red Hat RHEL 3.0
- Open VMS Alpha (64-bit), Release 7.2+ (excluding Release 7.3)
- OS/390, Version 2, Release 10
- Solaris (64-bit), Version 8 or 9+
- Tru64 UNIX (64-bit), Version 5.1A or 5.1B
- Windows (32-bit on Intel) Windows NT 4 Server, Windows 2000 Server, Windows Server 2003, Windows XP Professional
- Windows (64-bit on Itanium) Windows Server 2003
- z/OS, Version 1
Availability, Pricing and Terms.
SAS Software is licensed on an annual basis. Please contact the
SAS Institute directly for more
SAS Institute Inc.
SAS Campus Drive
Cary, NC 27513-2414
Telephone: (919) 677-8000
Fax: (919) 677-4444
SAS Home Page: http://www.sas.com/
Statistics and Operations Research: http://www.sas.com/rnd/app/
Recent papers and documentation on the survey selection and analysis procedures are available from SAS Institute's Statistics and Operations Research website at
http://support.sas.com/rnd/app/da/new/dasurvey.html; see links at bottom of that page for papers
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