A Note on Good Model Fit
Model fit is based on how close the model-implied covariance matrix is to the observed covariance matrix
* also known as "non-normed fit index (NNFI)"
The confirmatory fit index (CFI) is calculated as:
where subscript 0 implies the null model, and subscript 1 implies the proposed model.
The Tucker Lewis index (TLI), also known as the non-normed fit index, is calculated as:
The Root mean squared error of approximation (RMSEA) is calculated as: