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CDF

Returns the area from zero to x under the beta density.
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CDF

 
doubleCDFdoublex
doublea
doubleb )[inline]
The CDF of the Beta distribution is identical to the regularized beta function:

where B(x; a, b) is the incomplete beta function and B(a, b) is the (complete) beta function.

An illustration is given below:
\graph  x=0:1, a=2, b=1:5:5

References

Cephes Math Library Release 2.8: June, 2000

Parameters

xa quantile in the range of 0<=x<=1
afirst shape parameter, a >0
bsecond shape parameter, b >0
Source Code

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