The results indicated significant effects for visual impairment [F(I, 46) = 4.21, p < .05, epsilon squared = .08] and for intellectual level [F(1, 46) = 18.52, p < .001, epsilon squared = .28], but not for the interaction.

A two (severity of visual impairment) by two (level of intelligence) multivariate analysis of covariance of the set of stereotyped movement scores (body movements, manipulation of objects, and self-injurious behavior) revealed a significant effect for the covariate [F(3, 43) = 3.24, p < .05, epsilon squared = .18] and significant main effects for the extent of visual impairment [F(3, 43) = 7.18, p = .001, epsilon squared = .33] and intellectual level [F(3, 43) = 4.22, p < .05, epsilon squared = .22], but not for the interaction.

A Monte Carlo investigation of three estimates of treatment magnitude:

Epsilon squared, eta squared, and omega squared.

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