# SAS Survival Analysis Techniques for Medical Research, by Alan Cantor

By Alan Cantor

While you're new to survival research or are looking to extend your functions during this region, you are going to reap the benefits of Alan Cantor's follow-up to Extending SAS Survival research suggestions for clinical study. This moment variation provides the speculation and strategies of survival research in addition to first-class discussions of the SAS systems used to enforce the equipment defined. New positive factors contain a dialogue of permutation and randomization assessments; a dialogue of using information imputation; an increased dialogue of energy for Cox regression; descriptions of the hot good points of SAS nine, resembling self belief bands for the Kaplan-Meier curve; appendixes that conceal mathematical and statistical historical past themes wanted in survival research; and pupil workouts. the hot beneficial properties, besides numerous helpful macros and diverse examples, make this an appropriate textbook for a direction in survival research for biostatistics majors and majors in comparable fields. This publication excels at featuring advanced principles in a manner that allows these with no powerful technical heritage to appreciate and practice the recommendations and strategies.

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Additional resources for SAS Survival Analysis Techniques for Medical Research, Second Edition

Example text

15. To use this macro you can fill in the parameters in the template. 11. 051783 If we consider a standard error of about 4% (based on the Greenwood formula) for the five-year survival estimate to be too large, we might consider planning for longer follow-up or a larger sample. 045 ,N = &nn , A = 4 , tau = 3 , t = 5); %end; %mend; %doit; Do you see how this works? We’ve created a macro called DOIT that contains a macro loop delimited by the DO and END statements. While a DATA step loop allows you to perform a set of statements in a DATA step several times, a macro loop allows you to run any segment of SAS code, including DATA steps, procs, and macros, several times.

If you use PLOT you get a graph of the survival curve. Here are a couple of suggestions. sas. sas on your computer. sas program contains the statement call gdrawl(xy1,xy2)color="cyan"; This produces a graph with light blue lines that look fine on a color monitor or when printed by a color printer. With a black and white printer, however, they are difficult to see. If you intend to print the graph on such a printer, you might want to change it to call gdrawl(xy1,xy2); The default color will be black.

0 for t = 10. Note that survival estimates are not defined for t between 1 and 2 or t between 2 and 3. This illustrates the fact that the method of Peto and Turnbull may result in an estimated survival function that excludes certain intervals. 3. Let’s pretend that we have learned that the death dates recorded were actually the dates that the deaths were reported and that the actual dates of death are unknown except that they are between some known earlier date and the date given in the original data.