Abstract
Khuri (1989) tests for the intraclass covariance structure implied by the balanced two-way mixed analysis of variance model by computing wilks' likelihood ratio test statistic using the sample covariance matrix of the vectors of treatment means. In the unbalanced case he uses a linear transformation to augment the treatment-mean vectors to vectors which are expected to satisfy the intraclass structure, and then computes Wilks' statistic using these augmented vectors. We point out that the augmentation process is in fact equivalent to deleting observations until the design is balanced, so that the augmented test actually uses less information than that contained in the original sample means.
Original language | English |
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Pages (from-to) | 355-357 |
Number of pages | 3 |
Journal | Journal of Statistical Planning and Inference |
Volume | 59 |
Issue number | 2 |
DOIs | |
State | Published - 15 Apr 1997 |
Keywords
- Intraclass covariance
- Random effects
- Unbalanced design