Statistics Toolbox™

betacdf - Beta cumulative distribution function

Syntax

p = betacdf(X,A,B)

Description

p = betacdf(X,A,B) computes the beta cdf at each of the values in X using the corresponding parameters in A and B. X, A, and B can be vectors, matrices, or multidimensional arrays that all have the same size. A scalar input is expanded to a constant array with the same dimensions as the other inputs. The parameters in A and B must all be positive, and the values in X must lie on the interval [0,1].

The beta cdf for a given value x and given pair of parameters a and b is

where B( · ) is the Beta function.

Examples

x = 0.1:0.2:0.9;
a = 2;
b = 2;
p = betacdf(x,a,b)
p = 
    0.0280  0.2160  0.5000  0.7840  0.9720

a = [1 2 3];
p = betacdf(0.5,a,a)
p =
    0.5000  0.5000  0.5000

See Also

cdf, betapdf, betainv, betastat, betafit, betalike, betarnd

bbdesign

betafit