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P_beta
Probability integral for beta distribution.
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Loading LOADSUB ALL FROM "IGAMMA.HTS"
or LOADSUB FROM "MATHLIB.HTS"
Usage REAL X,A,B,Y
Y=FNP_beta(A,B,X)
Description
FNP_beta returns the value of the probability integral of the univariate beta probability density function with parameters a and b at x, P(x;a,b). P(x;a,b) is defined only for a 0 and b 0.
P(x;a,b) is defined by the expression
 When 0 x 1, P(x;a,b) is related to the incomplete beta function returned by FNIbeta, Bx(a,b), by the expression
 P(x;a,b)
 The function P(x;a,b) is sometimes written Ix(a,b).
Errors
FNP_beta causes an HTBasic error if its arguments are not all of type REAL or if a or b is negative.
See Also
Beta, Ibeta, F_beta, Q_beta
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