EducationalTestingService / EducationalTestingService/factor_analyzer

Add CFI and RMSEA goodness-of-fit metrics

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Description

My (quite inexpert) understanding is that CFI and RMSEA are the goodness-of-fit measures par excellence when it comes to CFA. It seems that Chi-squared is also useful.

Would it be possible to add these metrics, like around here? https://github.com/EducationalTestingService/factor_analyzer/blob/main/factor_analyzer/confirmatory_factor_analyzer.py#L379

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