Estimation of a model in which that parameter was freed produced substantially improved fit statistics, scaled χ 2 (18, N = 1, 826) = 235.36, CFI = 0.94, RMSEA = 0.075 (CLs = 0.065, 0.083), and a highly significant single degree-of-freedom scaled-chi-square difference (Satorra and Bentler, 2001 ) of 77.90.
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