The FREQ Procedure Table of fbu by nfbu fbu nfbu Frequency| 0| 1| Total ---------+--------+--------+ 0 | 35 | 72 | 107 ---------+--------+--------+ 1 | 19 | 67 | 86 ---------+--------+--------+ Total 54 139 193 Statistics for Table of fbu by nfbu McNemar's Test ------------------------ Statistic (S) 30.8681 Wrong Unconditional logistic regr. for crash data PROC GENMOD is modeling the probability that fataln='0'. One way to change this to model the probability that fataln='1' is to specify the DESCENDING option in the PROC statement. Analysis Of Parameter Estimates Standard Wald 95% Chi- Pr> Parameter DF Estimate Error C. L. Square ChiSq Intercept 1 -2.6645 1.4605 -5.5270 0.1981 3.33 0.0681 beltn 1 2.6645 0.3647 1.9496 3.3793 53.36 <.0001 case 5 1 -0.0000 2.0000 -3.9199 3.9199 0.00 1.0000 case 11 1 2.6645 2.0330 -1.3201 6.6490 1.72 0.1900 case 12 1 1.3322 2.2494 -3.0766 5.7410 0.35 0.5537 case 15 1 0.0000 2.0000 -3.9199 3.9199 0.00 1.0000 [Lots of other cases deleted] Wrong Unconditional probit regr. for crash data The GENMOD Procedure Model Information Data Set WORK.PAIRED Distribution Binomial Link Function Probit Dependent Variable fataln Observations Used 386 Analysis Of Parameter Estimates Standard Wald 95% Chi- Pr> Parameter DF Estimate Error C. L. Square ChiSq Intercept 1 -1.6212 0.9107 -3.4062 0.1637 3.17 0.0750 beltn 1 1.6212 0.2098 1.2101 2.0324 59.72 <.0001 ... Conditional logistic regression for case-control The PHREG Procedure Analysis of Maximum Likelihood Estimates Parameter Standard Chi- Hazard Variable DF Estimate Error Square Pr>ChiSq Ratio beltn 1 1.16071 0.21575 28.9444 <.0001 3.192 Conditional logistic regression with matching Analysis of Maximum Likelihood Estimates Parameter Standard Chi- Hazard Variable DF Estimate Error Square Pr>ChiSq Ratio beltn 1 1.33221 0.25791 26.6806 <.0001 3.789 Matched Conditional logistic regression, more data Analysis of Maximum Likelihood Estimates Parameter Standard Chi- Hazard Variable DF Estimate Error Square Pr>ChiSq Ratio beltn 1 1.33221 0.25791 26.6806 <.0001 3.789 McNemar test The FREQ Procedure Table of fbu by nfbu fbu nfbu Frequency| 0| 1| Total ---------+--------+--------+ 0 | 35 | 72 | 107 ---------+--------+--------+ 1 | 19 | 67 | 86 ---------+--------+--------+ Total 54 139 193 Conditional logistic regression with matching Extra covariate, larger matched sets Parameter Standard Chi- Hazard Variable DF Estimate Error Square Pr>ChiSq Ratio beltn 1 1.79226 0.30244 35.1179 <.0001 6.003 v1 1 0.22060 0.06405 11.8634 0.0006 1.247