does spss work with heterogeneity can snakes have different types of tails how to get rid of heterogeneity in ancova why is body length a dependent variable in regression analysis? how to get rid of heterogeneity can a species variable be a covariate in spss what is the variable in anchova what is the variable species in ancova? what is the difference between body length and tail length in ancova can i get rid of the heterogeneity of regression slopes how to get rid of heterogeneity of regression slope how to get rid of heterogeneity in spss can you do a phd with species as independent variable how do you break assumptions about the variability of the regression equations can you set body length as a covariate and tail length as a dependent what is the dependent variable for ancova can you use spss as dependent variable? what is the difference between a random and a covariate how can i get rid of homogeneity of regression slopes using spss does snake have a covariate or dependent variable