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.