main effect


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main effect

[¦mān i′fekt]
(statistics)
The effect of the change in level of one factor in a factorial experiment measured independently of other variables.
References in periodicals archive ?
The 2D/4D main effect was significant for the multivariate analysis and the univariate analysis for Accuracy, but the 2D/4D main effect was not significant for Reaction Time (Tables 2, 3, and 4).
The SSO main effect on percentage of days abstinent "may have been in part due to die SSO's role in supporting abstinence," she explained.
Our assumption was there might be a main effect for brand familiarity, such that more familiar brands might be viewed more positively than unfamiliar brands.
The main effect of drug 'A' is calculated from those groups of subjects that receive drug 'A' (+) compared with those who do not (-).
D'Annunzio says that the main effect is the elimination of radicals responsible for odors and ink migration, the decrease in the amount of expensive photo-initiators inside UV ink formulations and the increase in curing speed rates.
For the communication factor, this analysis revealed a significant main effect for vignette, F(1,93) = 12.
Even when crackdowns on drug crops show clearer results, their main effect is to shift cultivation from country to country.