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scipy.special.btdtri
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scipy.special.btdtri(x1, x2, x3[, out]) = <ufunc 'btdtri'>
x=btdtri(a,b,p) returns the pth quantile of the beta distribution. It is
effectively the inverse of btdtr returning the value of x for which
btdtr(a,b,x) = p. SEE ALSO betaincinv