An EM algorithm for proportional odds ordinal regression with outcome-dependent nonignorable missing responses is proposed, simulated, and applied to a Phase III psoriasis trial.
Testing measurement invariance with ordinal missing data: A comparison of estimators and missing data techniques.Multivariate Behavioral Research2020; 55(1): 87–101
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Cumulative Logit Ordinal Regression with Proportional Odds under Nonignorable Missing Response -- Application to Phase III Trial
An EM algorithm for proportional odds ordinal regression with outcome-dependent nonignorable missing responses is proposed, simulated, and applied to a Phase III psoriasis trial.