For this case, we let x1 represent public practice organization and x2 represent proportion of time spent in current job in accounting/auditing. We can come up with an equation for non-public practice firms (with x1=0, meaning the interaction term is 0 as well), and another one for public practice firms (with x1 = 1). In the regressions equations, the mean values of the continuous covariates (e.g. age, proportion of time spent in current job in tax) were multiplied by their respective regression coefficient, while for the other dichotomous variables, the base case with a value of 0 was used. After some substitutions and additions, the regression equations are as follows