Module function that returns the statistical significance computed with the F test
Double_Type get_ftest(Integer_Type, Double_Type, Integer_Type,
Double_Type)
Error Return Value: NULL
Arguments:
(1) number of degrees of freedom d_1
(2) observed statistic value chi_1^2
(3) number of degrees of freedom d_2
(4) observed statistic value chi_2^2
This function returns the tail integral of the
F distribution, alpha_F.
See the related Sherpa command
FTEST
for more information.
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