CAS Exam MAS-II Fall 2018, Question 9
Study guide: Exam MAS-II
While fitting a Linear Mixed Model, problems arose with the estimation of the covariance parameters. The following alternative approaches for the estimation of the covariance parameters were analyzed:
- I. Fit the implied marginal model.
- II. Fit the marginal model with an unstructured covariance matrix.
- III. Choose alternative starting values for covariance parameter estimates.
Determine which of the alternative approaches above are appropriate for the estimation of the covariance parameters.
- A) None are appropriate
- B) I and II only
- C) I and III only
- D) II and III only
- E) The answer is not given by (A), (B), (C), or (D)
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