And you're right: I'm not sure why I expected the odds ratio to be the same between the two situations. In fact, I re-ran the regression with just the Kennel Cough variable and lo-and-behold I got the PROC FREQ odds ratio. Thanks for knocking some sense into my tired brain! PROC FREQ in SAS is a procedure for analyzing the count of data. It is used to obtain frequency counts for one or more individual variables or to create two-way tables cross-tabulations from two variables.

PROC FREQ: It’s More Than Counts Richard Severino, The Queen’s Medical Center, Honolulu, HI ABSTRACT The FREQ procedure can be used for more than just obtaining a. the SAS® documentation, “the FREQ procedure produces one-way to n-way frequency and cross-tabulation tables”. If you specify the COMOR option in the EXACT statement, PROC FREQ computes exact confidence limits for the common odds ratio for stratified tables. This computation assumes that the odds ratio is constant over all the tables. Exact confidence limits are constructed from the distribution of, conditional on the marginal totals of the tables. The CHISQ option produces several chi-square tests, and the RELRISK option produces relative risk measures. The EXACT statement requests the exact Pearson chi-square test and exact confidence limits for the odds ratio. proc freq data=FatComp order=data; format Exposure ExpFmt. The following types of confidence limits are available for the odds ratio: exact, exact mid-p, likelihood ratio, score, Wald, and Wald modified.Wald Confidence Limits The asymptotic Wald confidence limits are based on a log transformation of the odds ratio Woolf 1955; Haldane 1955.PROC FREQ computes the Wald confidence limits as.

PROC FREQ IS MORE THAN JUST SIMPLY GENERATING A 2-BY-2 TABLE, continued 6 The outputs below report stratum-specific chi-square statistics and odds ratio for each race group. The last output contains Mantel-Haenszel statistics and the adjusted odds ratio, along with the. You may also want to check out, FAQ: How do I use odds ratio to interpret logistic regression?, on our General FAQ page. Introduction. Let’s begin with probability. Let’s say that the probability of success is.8, thus. p =.8. Then the probability of failure is. In this module we will address categorical data or count data. successfully completing this module, students will be able to: Perform a one sample test of proportions, including with proc freq; Define "odds" and distinguish between. SAS calculates the odds ratio assuming that column 1 is the event of interest and row 1 is the. Using proc freq to Perform Chi-Square Tests Example: The Kawasaki study data are in a SAS data set with 167 observations one for each child and three variables, an ID number, treatment arm GG or ASA, and an indicator variable for any CA abnormality at visit 3 or visit 4. Using the estimated variance for log OR MH given by Robins, Breslow, and Greenland 1986, PROC FREQ computes the corresponding % confidence limits for the odds ratio as where Note that the Mantel-Haenszel odds ratio estimator is less sensitive to small n h than the logit estimator.

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