Module ftest

Returns the (1-tailed) significance level (p-value) of an F statistic given the degrees of freedom for the numerator (dfR-dfF) and the degrees of freedom for the denominator (dfF).

Usage: lfprob(dfnum, dfden, F) where usually dfnum=dfbn, dfden=dfwn

Returns the incomplete beta function:

I-sub-x(a,b) = 1/B(a,b)*(Integral(0,x) of t^(a-1)(1-t)^(b-1) dt)

where a,b>0 and B(a,b) = G(a)*G(b)/(G(a+b)) where G(a) is the gamma function of a. The continued fraction formulation is implemented here, using the betacf function. (Adapted from: Numerical Recipies in C.)

Usage: lbetai(a,b,x)

This function evaluates the continued fraction form of the incomplete Beta function, betai. (Adapted from: Numerical Recipies in C.)

Usage: lbetacf(a,b,x)

Returns the gamma function of xx. Gamma(z) = Integral(0,infinity) of t^(z-1)exp(-t) dt. (Adapted from: Numerical Recipies in C.)

Parameters:

• xx - float

Returns: float

Returns the gamma function of xx. Gamma(z) = Integral(0,infinity) of t^(z-1)exp(-t) dt. Adapted from: Numerical Recipies in C. Can handle multiple dims ... but probably doesn't normally have to.

Usage: agammln(xx)