p. 403, line after equation (13.9): Insert a minus sign before the
summation symbol in the definition of .
p. 403, footnote 1: Arguably, ``predicted nonstorm'' should be
``nonpredicted nonstorm,'' as no storm occurred, contrary to predictions.
p. 411, equation (13.18): A couple of small technical corrections.
'' should be ``
''. The sentence that follows the equation is
incorrect -- the equation really says that must be a stationary
point of , regardless of , which leads to the useless solution
mentioned later on (