Conditional Logistic Regression Model for Odds of Amenorrhea |
Clinical Trial of Contracepting Women |
Model Information | |
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Data Set | WORK.AMEN |
Response Variable | y |
Number of Response Levels | 2 |
Number of Strata | 1151 |
Number of Uninformative Strata | 664 |
Frequency Uninformative | 1810 |
Model | binary logit |
Optimization Technique | Newton-Raphson ridge |
Number of Observations Read | 4604 |
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Number of Observations Used | 3616 |
Response Profile | ||
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Ordered Value |
y | Total Frequency |
1 | 1 | 1231 |
2 | 0 | 2385 |
Note: | 988 observations were deleted due to missing values for the response, explanatory, or strata variables. |
Strata Summary | ||||
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Response Pattern |
y | Number of Strata |
Frequency | |
1 | 0 | |||
1 | 0 | 1 | 144 | 144 |
2 | 1 | 0 | 54 | 54 |
3 | 0 | 2 | 82 | 164 |
4 | 1 | 1 | 50 | 100 |
5 | 2 | 0 | 23 | 46 |
6 | 0 | 3 | 31 | 93 |
7 | 1 | 2 | 27 | 81 |
8 | 2 | 1 | 15 | 45 |
9 | 3 | 0 | 11 | 33 |
10 | 0 | 4 | 261 | 1044 |
11 | 1 | 3 | 145 | 580 |
12 | 2 | 2 | 136 | 544 |
13 | 3 | 1 | 114 | 456 |
14 | 4 | 0 | 58 | 232 |
Convergence criterion (GCONV=1E-8) satisfied. |
Model Fit Statistics | ||
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Criterion | Without Covariates |
With Covariates |
AIC | 1367.057 | 949.276 |
SC | 1367.057 | 974.049 |
-2 Log L | 1367.057 | 941.276 |
Testing Global Null Hypothesis: BETA=0 | |||
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Test | Chi-Square | DF | Pr > ChiSq |
Likelihood Ratio | 425.7810 | 4 | <.0001 |
Score | 384.0000 | 4 | <.0001 |
Wald | 301.3065 | 4 | <.0001 |
Analysis of Maximum Likelihood Estimates | |||||
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Parameter | DF | Estimate | Standard Error |
Wald Chi-Square |
Pr > ChiSq |
time | 1 | 0.7587 | 0.3766 | 4.0577 | 0.0440 |
time2 | 1 | 0.0367 | 0.0742 | 0.2442 | 0.6212 |
time*trt | 1 | 1.2107 | 0.5324 | 5.1720 | 0.0230 |
time2*trt | 1 | -0.2235 | 0.1040 | 4.6126 | 0.0317 |