A NECESSARY AND SUFFICIENT CONDITION FOR IDENTIFICATION OF CONFIRMATORY FACTOR-ANALYSIS MODELS OF FACTOR COMPLEXITY ONE

After specification of a structural equation model and before estimati on of parameters, the identification status of the model must be deter mined For the measurement portion of the model however there are very few rules to help the researcher verify whether the model is identifie d or not This article introduces a necessary and sufficient identifica tion rule for models of factor complexity one. The rule is easy to und erstand is easy to apply and applies to portions as well as to the who le model. Moreover it provides a diagnostic tool that helps with ident ification questions. Many examples are given.