I have performed cross-lagged analyses, two waves (time 1 and time 2) in AMOS following the four steps: the first one autoregressive, the second normal causation model keeping autoregressive paths, than reversed causation model keeping also autoregressive paths, and finaly I made a model including everything from step 1 to step 3, and AMOS did not want to calculate chi square, it is sad that "The model has zero degrees of freedom. The model should fit the data perfectly, and the chi-square statistic should be zero. Consequently, no probability level can be assigned to the chi-square statistic. The model is untestable". Do you know what is this, and how to fix it.
Thank you so much!