可~乐 发表于 2012-5-1 17:52
首先谢谢bobguy大神,对于cdf,我查看过,这个好像里面都是一元的,我想做二元的,不知能否。。。
SAS provides cdf function of bivarite normal distribution(attached below ). I don't think there is any for t-distribution.
For multivariate normal distribution , a hermite polynomial function approximation calculation may be used. I used to integral a trivariate normal distribution.
http://en.wikipedia.org/wiki/Hermite_polynomials
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Syntax
PROBBNRM(x,y,r)
Required Arguments
x
specifies a numeric constant, variable, or expression.
y
specifies a numeric constant, variable, or expression.
r
is a numeric correlation coefficient.
Range:-1 ≤ r ≤ 1