bartz.testing.Distr

class bartz.testing.Distr[source]

Family of standardized distributions: mean 0, variance 1.

abstract property kurtosis: Float[Array, ''] | float[source]

Fourth moment E[z ** 4] of the standardized draws.

abstractmethod sample(key, shape)[source]

Sample i.i.d. standardized values.

Return type:

Float[Array, '*shape']

abstractmethod quantize(x, max_bins)[source]

Quantize values elementwise into equal-probability bins.

Parameters:

  • x (Float[Array, '*shape']) – Values drawn from the distribution, of any shape.

  • max_bins (int) – Maximum number of levels.

Returns:

  • quantized_x (UInt[Array, ‘*shape’]) – The bin indices, in [0, m).

  • m (Integer[Array, ‘’] | int) – The number of levels, <= max_bins.

abstractmethod ppf(u)[source]

Quantile function mapping probabilities in [0, 1] to standardized values.

Return type:

Float[Array, '*shape']

from_standard_normal(z)[source]

Map standard-Normal draws to this family, preserving their Gaussian copula.

Elementwise ppf(Phi(z)): each output is marginally a draw from this family (mean 0, variance 1) while the joint dependence of z carries over as a Gaussian copula. Normal overrides this with the identity.

Return type:

Float[Array, '*shape']