A new approximation for the chi-square integral

Gray, H. L.; Thompson, R. W.; McWilliams, G. V.

doi:10.1090/S0025-5718-1969-0238470-5

A new approximation for the chi-square integral
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by H. L. Gray, R. W. Thompson and G. V. McWilliams PDF

Math. Comp. 23 (1969), 85-89 Request permission

Abstract:

In this paper a new method for estimating the value of an improper integral by a finite sum is introduced. In particular, the method is applied to the Chi-Square integral and proves to be of some value in estimating the value of this integral for values equal or greater than .9.

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