On Aug 15, 4:06 am, djh <firstname.lastname@example.org> wrote: > Before responding to your prior post of 8/5@3:12 regarding my lastest > proposed design, I wanted to clarify the question I was asking about > identity of intercepts. > > Given > > x1 on x2 > x1 on x3 > x1 on (x2,x3) > > I was not asking whether the single intercept from x1 on (x2,x3) is > identical to the intercept from x1 on x2 and the intercept from x1 on > x3. > > Rather, I was asking the following question relative to the x1 on > (x2,x3) regression itself. > > Let M be the multiple linear regression x1 on (x2,x3) with single > intercept I and two regression lines L2 and L3 for the x2 and x3 > variables respectively. > > Isn't it the case that both of the lines L2 and L2 share the common > intercept I. > > If this is true "by definition", I apologize for asking the obvious. > I just want to be sure that my assumption here is correct.