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Details van artikel 13 van 17 gevonden artikelen
| Titel: |
Power of analysis of covariance tests under conditional specification |
| Auteur: |
Hawkins, D. L. Han, Chien-Pai |
| Verschenen in: |
Communications in statistics |
| Paginering: | Jaargang 15 (1986) nr. 2 pagina's 323-343 |
| Jaar: |
1986 |
| Inhoud: |
The procedure-wise power functions of two strategies for balanced single-factor analysis of covariance in the presence of possibly unequal regression slopes are evaluated and illustrated. The strategies differ in the action to be taken following a re-^ jection by the preliminary test for equal slopes. The first strategy simply discards the covariate and respecifies the model as the one-way ANOVA model for testing factor effects. The second leaves the unequal slopes covariance model intact, but respecifies the factor effects hypothesis to address the factor level means adjusted to the sample average of the covariate. One additional strategy, that of testing factor effects only if the preliminary slopes test does not reject, is included for comparison purposes. Computation of the power functions requires extensive use of the results obtained in Hawkins and Han (1986) concerning the bivariate distributions of certain ratios of independent noncentral chi-square random variables. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 13 van 17 gevonden artikelen
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