pdf

Exponential.pdf(X)

Probability density function (PDF).

The PDF for the two-parameter exponential distribution is:

\[f(x | \alpha, \beta) = \alpha \cdot e^{-\alpha \cdot (x - \beta)}\]

where \(\alpha\) is the rate parameter and \(\beta\) is the location parameter. The function is zero for \(x < \beta\).

Parameters:

X (ArrayLike) – The input data points at which to evaluate the PDF.

Returns:

The PDF values corresponding to each point in X.

Return type:

NDArray[np.float64]