what is the parameter estimate for lev what is the parameter estimate for lev? what is the p value of areg beta is group cl lev significant is the p value of group cl.lev significant is the parameter estimate significant when to add lev to linear regression what is the p value for group in stata areg beta what is the p value of areg beta how to find p value of areg beta if the p value of lev is significant, how to i know the difference between msest and r-squared? is lev a linear regression model is it significant to estimate lev is lev a statistical variable is group in lev a continuous variable is lev a linear variable is the p value of areg beta in stata significant areg beta group#cl.lev i.year _______________ is an independent variable mse value for lev