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McKean suggested two models, both with
and
. For the first,
![\begin{displaymath}
f(v) = \left\{\begin{array}{cc}-v &v<{\alpha\over 2}\\
v-\a...
...1+\alpha\over 2}\\ 1-v&v >{1+\alpha\over 2}
\end{array}\right.
\end{displaymath}](img19.gif) |
(5) |
where
.
The second model suggested by McKean had
![\begin{displaymath}
f(v) = \left\{\begin{array}{cc}-v &v<\alpha\\
1-v&v >\alpha
\end{array}\right.
\end{displaymath}](img20.gif) |
(6) |
and
. This is an extremely popular model with hundreds of
related papers.