ANACOVAAnalysis of Covariance (statistical method)
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In particular: (1) multivariate regression analysis was performed to obtain the best fit response surface model of efficiency as a function of voltage and velocity; (2) regression analysis, ANOVA, and ANACOVA were performed to deter mine the effects of dust type and uneven levels of concentration on collection efficiency.
The effect of dust type was analyzed by means of regression analysis with ANACOVA.
ANACOVA enabled simultaneous comparisons of the three dust types using their least square means instead of their arithmetic means to account for other effects in the model caused by having an unbalanced design.