Complex Survey Data Analysis with SAS by Taylor H. Lewis

By Taylor H. Lewis

Complex Survey facts research with SAS® is a useful source for utilized researchers reading information generated from a pattern layout concerning any blend of stratification, clustering, unequal weights, or finite inhabitants correction elements. After basically explaining how the presence of those good points can invalidate the assumptions underlying most standard statistical strategies, this ebook equips readers with the data to hopefully account for them through the estimation and inference method through using the SURVEY family members of SAS/STAT® procedures.

The ebook deals accomplished assurance of the main crucial issues, including:

  • Drawing random samples
  • Descriptive information for non-stop and specific variables
  • Fitting and studying linear and logistic regression models
  • Survival analysis
  • Domain estimation
  • Replication variance estimation methods
  • Weight adjustment and imputation tools for dealing with lacking data

The easy-to-follow examples are drawn from real-world survey info units spanning a number of disciplines, all of that are downloaded at no cost besides syntax records from the author’s site:

While different books could contact on a few of the comparable concerns and nuances of advanced survey facts research, none gains SAS completely and as exhaustively. one other special point of this publication is its abundance of convenient workarounds for yes strategies no longer but supported as of SAS model 9.4, corresponding to the ratio estimator for a complete and the bootstrap for variance estimation.

Taylor H. Lewis

is a PhD graduate of the Joint software in Survey method on the collage of Maryland, collage Park, and an accessory professor within the George Mason college division of data. An avid SAS consumer for 15 years, he's a SAS qualified complex programmer and a nationally famous SAS educator who has produced dozens of papers and workshops illustrating tips on how to successfully and successfully behavior statistical analyses utilizing SAS.

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Sample text

Alternatively, variable selection probabilities can be assigned to sampling units prior to implementing the randomized sampling mechanism. In spite of certain benefits, variable selection probabilities complicate matters because we must introduce a weight wi, which is referred to synonymously as a sample weight, base weight, or design weight, to compensate for the relative degrees of over-/underrepresentation of units drawn into the sample. Specifically, Horvitz and Thompson (1952) showed that unbiased estimates of finite population quantities can be achieved by assigning each of the i = 1,…, n units in the sample a weight of wi = 1/Pr(i ∈ S), where Pr(i ∈ S) denotes the ith unit’s selection probability into the given sample S.

The second is to specify the sampling fraction n/N in the RATE = option of the PROC statement. 20 has the same effect. The syntax to account for the FPC is identical across all SURVEY procedures, and the same is true for the other three features of complex survey data as well. Suppose the SAS data set SAMPLE_SRSWOR contains the results of this survey of n = 400 adults in the town. 1 consists of two PROC SURVEYMEANS runs on this data set. We will explore the features and capabilities of PROC SURVEYMEANS in more detail in Chapter 3, but for the moment note that we are requesting the sample mean and its estimated variance for the OTC expenditures variable (EXP_OTCMEDS).

Of course, collecting data comes at a cost. In the United States, for-profit businesses do not generally conduct surveys and release raw data files to the public free of charge. More commonly, surveys are funded by one or more government agencies. These agencies are ideally apolitical and charged solely with the task of impartially collecting and disseminating data. gov/agencies/ more or less fits this description. Aside from preformatted tables and reports, data dissemination often takes the form of a raw or microdata file posted on the survey website for open access.

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