A Comparison of the Precision of Three Experimental Designs Employing a Concomitant Variable  

Oleh:

Feldt, Leonard S.

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 23 no. 4 (Dec. 1958), page 335-353.
Topik: Experimental Precision; Two-Factor Analysis of Variance; Analysis of Covariance
Fulltext: Vol 23 No. 4 Dec 1958 p.335-353.pdf (940.86KB)

Isi artikel

Three techniques are commonly employed to capitalize on a concomitant variate and improve the precision of treatment comparisons: (1) stratification of the experimental samples and use of a factorial design, (2) analysis of covariance, and (3) analysis of variance of difference scores. The purpose of this paper is to compare the effectiveness of these alternatives in improving experimental precision, to identify the most precise design and the conditions under which its advantage holds, and to derive, in the case of the factorial approach, recommendations as to the optimal numbers of levels.

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