MATH 376 -- Probability and Statistics II
F-distributions
January 27, 2006
The F-distribution describes the distribution of a
ratio of two - distributed random variables, scaled
by the numbers of degrees of freedom of each: If
is ( ) and is ( ) , then the ratio
has an F-distribution with `` numerator
degrees of freedom'', and `` denominator degrees of
freedom''. F-distributions are always skewed, with
expected value > 1, if
> | read "/home/fac/little/public_html/ProbStat0506/MSP.map"; |
> | plot([y->FPDF(3,4,y),y->FPDF(5,20,y),y->FPDF(7,300,y)],0..5,color=[red,blue,black]); |
> |