ChandraCXC / iris-dev

repository for tracking Iris development tasks
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Add vanilla chi-squared statistic to Fitting Tool #70

Closed jbudynk closed 8 years ago

jbudynk commented 8 years ago

The chi-squared statistics currently used in Iris are variations on chi-squared, not the standard, vanilla chi-squared statistic:

chi^2 = sum[(obs(i)-mod(i))/sigma_obs(i)]^2

where obs(i) is the data and mod(i) is the model. We should add the generic chi-squared statistic as an option.