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In this paper, we discuss the two possible statistical approaches when IV are continuous : analysis of variance and multiple linear regression. The statistical model common to these two approaches, and analysis of covariance is first briefly reminded. Using general arguments, followed by a psycholinguistic illustration, we discuss the advantages and drawbacks of using an experimental control of confoundings and random variability, which leads to analysis of variance, or a statistical control, which leads to multiple regression analysis. The problems to avoid for insuring the validity of the chosen approach are also underlined.
