Piecewise Constant Regression Analysis (Control Only) ----------------------------------------------------- The GENMOD Procedure Model Information Data Set WORK.RATS_PW Distribution Poisson Link Function Log Dependent Variable count Offset Variable loglen Number of Observations Read 100 Number of Observations Used 100 Class Level Information Class Value Design Variables interval 1 0 0 0 2 1 0 0 3 0 1 0 4 0 0 1 Parameter Information Parameter Effect interval Prm1 Intercept Prm2 interval 2 Prm3 interval 3 Prm4 interval 4 Criteria For Assessing Goodness Of Fit Criterion DF Value Value/DF Deviance 96 163.3078 1.7011 Scaled Deviance 96 163.3078 1.7011 Pearson Chi-Square 96 144.4919 1.5051 Scaled Pearson X2 96 144.4919 1.5051 Log Likelihood -87.0277 Algorithm converged. Estimated Covariance Matrix Prm1 Prm2 Prm3 Prm4 Prm1 0.02941 -0.02941 -0.02941 -0.02941 Prm2 -0.02941 0.05441 0.02941 0.02941 Prm3 -0.02941 0.02941 0.05115 0.02941 Prm4 -0.02941 0.02941 0.02941 0.06167 Analysis Of Parameter Estimates Standard Wald 95% Chi- Parameter DF Estimate Error Confidence Limits Square Pr > ChiSq Intercept 1 -3.0937 0.1715 -3.4298 -2.7576 325.42 <.0001 interval 2 1 0.1625 0.2333 -0.2947 0.6197 0.49 0.4860 interval 3 1 0.3023 0.2262 -0.1410 0.7456 1.79 0.1814 interval 4 1 -0.1569 0.2483 -0.6436 0.3298 0.40 0.5275 Scale 0 1.0000 0.0000 1.0000 1.0000 NOTE: The scale parameter was held fixed.