Response Profile Ordered Total Value status Frequency 1 dead 41 2 alive 139 PROC GENMOD is modeling the probabilities of levels of status having LOWER Ordered Values in the response profile table. Analysis Of Parameter Estimates Chi- Parameter Square Pr > ChiSq Intercept1 6.12 0.0133 drug n 3.72 0.0537 drug s . . ldose 2.33 0.1270 ldose*ldose 0.54 0.4627 ldose*drug n 1.05 0.3052 ldose*drug s . . ldose*ldose*drug n 0.21 0.6447 ldose*ldose*drug s . . Smaller Model Estimated Correlation Matrix Intercept1 Prm1 Prm3 Intercept1 1.0000 -0.7870 -0.6837 Prm1 -0.7870 1.0000 0.4496 Prm3 -0.6837 0.4496 1.0000 Analysis Of Parameter Estimates Standard Wald 95% Confidence Parameter DF Estimate Error Limits Intercept1 1 -2.4476 0.4532 -3.3359 -1.5593 drug n 1 1.2545 0.5033 0.2680 2.2409 drug s 0 0.0000 0.0000 0.0000 0.0000 ldose 1 0.7234 0.1177 0.4927 0.9541 runn name barW barY tau sigma LD50 Known Var. 0.7234 2.44760 0.1177 0.4532 LD75 Known Var. 0.7234 3.54621 0.1177 0.4532 Pote Known Var. 0.7234 1.25450 0.1177 0.5033 rho alpha bot elower eupper 0.6837 0.05 0.89831 12.0153 85.692 0.6837 0.05 0.89831 50.2450 602.591 0.4496 0.05 0.89831 1.5311 20.080 Probit Scale Analysis Of Parameter Estimates Standard Wald 95% Confidence Parameter DF Estimate Error Limits Intercept 1 -1.4164 0.2480 -1.9025 -0.9303 drug n 1 0.7682 0.2911 0.1977 1.3386 drug s 0 0.0000 0.0000 0.0000 0.0000 ldose 1 0.4096 0.0614 0.2892 0.5300 Scale 0 1.0000 0.0000 1.0000 1.0000 runn name barW barY tau sigma LD50 Known Var. 0.4096 1.41640 0.0614 0.2480 LD75 Known Var. 0.4096 2.09089 0.0614 0.2480 Pote Known Var. 0.4096 0.76820 0.0614 0.2911 rho alpha bot elower eupper 0.6133 0.05 0.91368 12.4362 97.586 0.6133 0.05 0.91368 57.8911 770.727 0.4611 0.05 0.91368 1.7319 23.175