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Last modified: 25 September 2018

URL: http://cxc.harvard.edu/sherpa/bugs/poisson.html

Bugs: poisson


Bugs

Implemented model is incorrect.

The Poisson model has a functional form of:

f(x) = A (mu!/x!) exp(x-mu)

but as implemented, the model is:

f(x) = A mu^(x-mu) exp(mu!-x!)