Probability density function.
(x, mu=0, sigma=1)
| 912 | return min(1.0, 0.5 * erfc((-x + mu) / (sigma * 2**0.5))) |
| 913 | |
| 914 | def pdf(x, mu=0, sigma=1): |
| 915 | """ Probability density function. |
| 916 | """ |
| 917 | u = (x - mu) / abs(sigma) |
| 918 | return (1 / sqrt(2*pi) * abs(sigma)) * exp(-u*u / 2) |
| 919 | |
| 920 | def tpdf(x, df): |
| 921 | """ Probability density function for the Student's t-distribution. |