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Multiple regressions. (a) Stepwise model based on the gray level, carcass weight and carcass fat area and their third-order interactions; (b) stepwise model based on the gray level, carcass weight and carcass fat area with their log transformations and fourth-order interactions; (c) stepwise model based on the gray level, carcass weight and carcass fat area with their log and square transformation and fourth-order interactions.
