To: Econ551 students: please note the following correction
    to the gamma distribution that I described in class.
    I thank the student and Moto Shintani for making me aware
    of this mistake, and my apologies:

John:

In my office hour, a student pointed out minor correction about gamma
distn in your lecture.

(correct pdf )
  b^a
------- x^(a-1)exp(-bx)   -->  E(x) = a/b, V(x) = a/(b^2)
gamma(a)

(pdf in lecture)
     1
----------- x^(a-1)exp(-x/b) --> E(x) = ab, V(x) = ab^2
gamma(a)b^a


I would appreciate if you could annouce in the lecture or through econ551
list in e-mail.

Thanks
Moto

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Mototsugu Shintani 
Department of Economics, Yale University
P.O.Box 205528 Yale Station
New Haven, CT 06520-5528 USA
e-mail:shintani@minerva.cis.yale.edu
       shintani@pantheon.yale.edu
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