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    ANCOVA with more than 2 covariates. homogeneity of regression slopes.

    Hello, I am carrying out a ANCOVA with more than 2 covariates with SPSS. I want to check the homogeneity of regression slopes to confirm the assumption. When in a ANCOVA with one covariates, I can understand. https://www.youtube.com/watch?v=oNX8hL6QHNM When in a ANCOVA with more than 2...