LikelihoodRatioTest¶
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class
sherpa.sim.simulate.
LikelihoodRatioTest
[source] [edit on github]¶ Bases:
sherpa.utils.NoNewAttributesAfterInit
Likelihood Ratio Test.
The likelihood ratio 1, D, is defined as:
( likelihood for null model ) D = -2 ln ----------------------------------- ( likelihood for alternative model) = -2 ln(likelihood for null model) + 2 ln(likelihood for alternative model)
Since the Cash and C fit statistics are defined as -2 ln(likelihood), the equation reduces to:
D = statistic for null model - statistic for alternative model
References
Methods Summary
calculate
(nullfit, altfit, proposal, …)run
(fit, null_comp, alt_comp[, conv_mdl, …])Methods Documentation
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static
calculate
(nullfit, altfit, proposal, null_vals, alt_vals)[source] [edit on github]¶
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static
run
(fit, null_comp, alt_comp, conv_mdl=None, stat=None, method=None, niter=500, numcores=None)[source] [edit on github]¶
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static