The sherpa.stats module

Classes

Stat(name)

The base class for calculating a statistic given data and model.

Chi2([name])

A Gaussian Log-likelihood function.

LeastSq([name])

Least Squared Statistic.

Chi2ConstVar([name])

Chi Squared with constant variance.

Chi2DataVar([name])

Chi Squared with data variance.

Chi2Gehrels([name])

Chi Squared with Gehrels variance.

Chi2ModVar([name])

Chi Squared with model amplitude variance.

Chi2XspecVar([name])

Chi Squared with data variance (XSPEC style).

Likelihood([name])

Likelihood functions

Cash([name])

Poisson Log-likelihood function.

CStat([name])

Poisson Log-likelihood function (XSPEC style).

WStat([name])

Poisson Log-likelihood function including background (XSPEC style).

UserStat([statfunc, errfunc, name])

Support simple user-supplied statistic calculations.

Class Inheritance Diagram

Inheritance diagram of Stat, Chi2, LeastSq, Chi2ConstVar, Chi2DataVar, Chi2Gehrels, Chi2ModVar, Chi2XspecVar, Likelihood, Cash, CStat, WStat, UserStat