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Marginal Log-linear Regression Model |
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Clinical Trial of Epileptic Patients |
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The GENMOD Procedure |
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Model Information |
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Data Set |
WORK.SEIZURE |
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Distribution |
Poisson |
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Link Function |
Log |
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Dependent Variable |
y |
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Offset Variable |
ltime |
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Observations Used |
295 |
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Class Level Information |
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Class |
Levels |
Values |
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id |
59 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 |
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Parameter Information |
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Parameter |
Effect |
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Prm1 |
Intercept |
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Prm2 |
time |
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Prm3 |
trt |
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Prm4 |
time*trt |
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Criteria For Assessing Goodness Of Fit |
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Criterion |
DF |
Value |
Value/DF |
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Deviance |
291 |
3575.4236 |
12.2867 |
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Scaled Deviance |
291 |
3575.4236 |
12.2867 |
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Pearson Chi-Square |
291 |
5726.7928 |
19.6797 |
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Scaled Pearson X2 |
291 |
5726.7928 |
19.6797 |
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Log Likelihood |
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6673.6613 |
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Algorithm converged. |
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Analysis Of Initial Parameter Estimates |
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Parameter |
DF |
Estimate |
Standard Error |
Wald 95% Confidence Limits |
Chi-Square |
Pr > ChiSq |
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Intercept |
1 |
1.3476 |
0.0341 |
1.2809 |
1.4144 |
1565.44 |
<.0001 |
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time |
1 |
0.1118 |
0.0469 |
0.0200 |
0.2037 |
5.69 |
0.0170 |
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trt |
1 |
0.0275 |
0.0467 |
-0.0640 |
0.1190 |
0.35 |
0.5553 |
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time*trt |
1 |
-0.1047 |
0.0650 |
-0.2322 |
0.0227 |
2.59 |
0.1073 |
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Scale |
0 |
1.0000 |
0.0000 |
1.0000 |
1.0000 |
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GEE Model Information |
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Correlation Structure |
Unstructured |
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Subject Effect |
id (59 levels) |
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Number of Clusters |
59 |
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Correlation Matrix Dimension |
5 |
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Maximum Cluster Size |
5 |
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Minimum Cluster Size |
5 |
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Algorithm converged. |
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Working Correlation Matrix |
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Col1 |
Col2 |
Col3 |
Col4 |
Col5 |
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Row1 |
1.0000 |
0.9433 |
0.7320 |
0.8208 |
0.6849 |
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Row2 |
0.9433 |
1.0000 |
0.8185 |
0.9433 |
0.7817 |
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Row3 |
0.7320 |
0.8185 |
1.0000 |
0.7144 |
0.5367 |
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Row4 |
0.8208 |
0.9433 |
0.7144 |
1.0000 |
0.6837 |
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Row5 |
0.6849 |
0.7817 |
0.5367 |
0.6837 |
1.0000 |
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Analysis Of GEE Parameter Estimates |
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Empirical Standard Error Estimates |
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Parameter |
Estimate |
Standard Error |
95% Confidence Limits |
Z |
Pr > |Z| |
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Intercept |
1.1213 |
0.4794 |
0.1817 |
2.0608 |
2.34 |
0.0193 |
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time |
0.1244 |
0.1245 |
-0.1197 |
0.3685 |
1.00 |
0.3179 |
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trt |
0.0718 |
0.5673 |
-1.0401 |
1.1837 |
0.13 |
0.8993 |
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time*trt |
-0.1150 |
0.2509 |
-0.6067 |
0.3768 |
-0.46 |
0.6468 |
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Analysis Of GEE Parameter Estimates |
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Model-Based Standard Error Estimates |
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Parameter |
Estimate |
Standard Error |
95% Confidence Limits |
Z |
Pr > |Z| |
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Intercept |
1.1213 |
0.1093 |
0.9071 |
1.3354 |
10.26 |
<.0001 |
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time |
0.1244 |
0.1751 |
-0.2189 |
0.4676 |
0.71 |
0.4775 |
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trt |
0.0718 |
0.1482 |
-0.2187 |
0.3623 |
0.48 |
0.6280 |
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time*trt |
-0.1150 |
0.2483 |
-0.6016 |
0.3716 |
-0.46 |
0.6433 |
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Scale |
4.9401 |
. |
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. |
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