Survival function¶
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bdtrc
(k, n, p)¶ Returns the sum of the terms k + 1 through n of the Binomial probability density:
Parameters:
Description¶
\[\sum_{j=k+1}^n {n \choose j} p^j (1-p)^{n-j}\]
The terms are not summed directly; instead the incomplete beta integral is employed, according to the formula:
y = bdtrc( k, n, p ) = incbet( k+1, n-k, p )
The arguments must be positive, with p ranging from 0 to 1.
Accuracy¶
Tested at random points (a, b, p).
a, b | relative error | |||
---|---|---|---|---|
arithmetic | domain | # trials | peak | rms |
For p between 0.001 and 1 | ||||
IEEE | 0, 100 | 100000 | 6.7e-15 | 8.2e-16 |
For p between 0 and .001 | ||||
IEEE | 0, 100 | 100000 | 1.5e-13 | 2.7e-15 |
Error messages¶
message | condition | value returned |
---|---|---|
bdtrc domain | x < 0, x > 1, n < k | 0.0 |