Normal approximation for call function of locally dependent random variables
Suporn Jongpreechaharn, Kritsana Neammaneea,b,*
ABSTRACT: A mean for the call function of random variable W, E(W ? k)
+
, where k is a positive real number, is useful
and important, for instance, in a collateralized debt obligation (CDO) tranche pricing. In previous works, E(W ? k)
+
is approximated by normal approximation where W is a sum of independent random variables. However, W in this
paper is extended to be a sum of locally dependent random variables. We propose a uniform bound on the normal
approximation by using the Stein?s method.