IBM® SPSS® Amos™ 28

If Null 2 is checked, the Null 2 model will be fitted and used to calculate CFI2 for each model generated by the specification search.

With incomplete data, both Saturated and Null 2 must be checked in order to fit the Null 2 model and to calculate CFI2.

In the Null 2 model, the correlations among the observed variables are required to be equal. The means and variances of the observed variables are unconstrained. (See Appendix F for more about null models.)