I have 6 series of observed values (y,y1,y2,y3,y4,x1,x2) that can be estimated as:
y=y1+y2 y1=a1+b1x1+c1x2 y2=a2+b2x1+c2x2 or, alternatively y=y3+y4 y3=a3+b3x1+c3x2 y4=a4+b4x1+c4x2 I'm particularly interested in the relationships b1/(b1+b2) and c1/(c1+c2), and its comparision with b3/(b3+b4) and c3/(c3+c4), respectively. How can I solve my problem? is it two independent regressions, a two stage regression, a seemingly [un]related regression or a three stage regression?. By the way, my sample is very small. Any -easy to read- reference would be also appreciated. Cave. . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
