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Model constraints of product indicator methods.
| Model constraint | Constrained product indicator (CPI) | Generalized appended product indicator (GAPI) | Unconstrained product indicator (UPI) |
|---|---|---|---|
| Mean of ξ1ξ2 | √ | √ | √ |
| Variance and covariances of ξ1ξ2 | √ | × | × |
| Factor loadings of product indicators | √ | √ | × |
| Unique factor variances of product indicators | √ | √ | × |
| Unique factor covariances of product indicators | √ | √ | √ |
