Calculates the statistical x2.
| 1 | 
| zetas | matrix of estimations of the parameters of the items (alphas, d's, guessing). | 
| patterns | list with Patterns, frequencies and traits. | 
| G | the number of groups, by default 10 | 
| FUN | It is the function with which the expected probability, by default median is calculated in each group. | 
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