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[?] Find quantiles for F distribution?

Posted 7 years ago

Hello, suppose i want to find qunatile for F distivution with the degree of fredom d1=2 d2=12 and 0.95 probability, And it must equal 3.89. But with my code i get 0.35. What's wrong with my code?

In[36]:= Clear["Global`*"]

x = 1-0.05;
c = PDF[FRatioDistribution[2 (1), 2 (6)], x]

Out[48]= 0.357409
POSTED BY: Alex Graham
2 Replies

Of course, there is a more direct way:

Quantile[FRatioDistribution[2 (1), 2 (6)], 0.95]

which give the same.

Cheers,

Marco

POSTED BY: Marco Thiel

Something like this?

NSolve[CDF[FRatioDistribution[2, 2*6], x] == 1 - 0.05, x]
(*{{x -> 3.88529}}*)

Cheers, Marco

POSTED BY: Marco Thiel
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