= T

To obtain a corresponding estimator for fJ.., we begin with (2.2.6) and write fJ.. = T-a~. (2.3.10)

From the second equation of (2.3.2), we write a~ = crQ - (.i - T), (2.3.11)

Chapter 2

and substitute into (2.3.10) to obtain J.L =.X - aQ.