Download Categorical Data Analysis Using the SAS System by Maura E. Stokes PDF

By Maura E. Stokes

Besides offering an invaluable dialogue of express facts research innovations, this ebook exhibits how one can practice those tools with the SAS process. The authors contain useful examples from a huge diversity of purposes to demonstrate using the FREQ, LOGISTIC, GENMOD, and CATMOD approaches in various analyses. in addition they talk about different approaches corresponding to PHREG and NPAR1WAY.

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The sampling unit is no longer one individual but a pair of related individuals, which could be two locations on the same individual or two occasions for the same individual. For example, in case-control studies, cases are often matched to controls on the basis of demographic characteristics; interest lies in determining whether there is a difference between control exposure to a risk factor and case exposure to the same risk factor. Other examples of matched pairs are left eye and right eye measurements, and husband and wife voting preferences.

418, as calculated above. 5763). Note that these limits are a little narrower than those computed above; again, these limits may not provide adequate coverage for moderately small sample sizes. Note that this table also includes the proportions of column 1 response in both rows, along with the asymptotic and exact confidence limits. Although some methods for exact confidence limits for the difference in proportions are available, statistical research concerning their properties and the development of possibly better methods is still ongoing.

8 in the previous chapter are only a subset of the data collected in the clinical trial. 1. These data comprise a set of two ¾ ¢ ¾ tables. 1. Center 1 1 Total 2 2 Total Respiratory Improvement Treatment Test Placebo Test Placebo Yes 29 14 43 37 24 61 No 16 31 47 8 21 29 Total 45 45 90 45 45 90 Investigators were interested in whether there were overall differences in rates of improvement; however, they were concerned that the patient populations at the two centers were sufficiently different that center needed to be accounted for in the analysis.

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