| Conditional Logistic Regression Model for Odds of Amenorrhea |
| Clinical Trial of Contracepting Women |
| Model Information | |
|---|---|
| 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 |
|---|---|
| Number of Observations Used | 3616 |
| Response Profile | ||
|---|---|---|
| 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 | ||||
|---|---|---|---|---|
| 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 | ||
|---|---|---|
| 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 | |||
|---|---|---|---|
| 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 | |||||
|---|---|---|---|---|---|
| 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 |