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Table 3 Model selection: All three groups: PD-On-Group, PD-Off-Group, and PSP Group

From: Motor function in Parkinson's disease and supranuclear palsy: simultaneous factor analysis of a clinical scale in several populations

   χ2 df RMSEA TLI CFI St.RMR Comments
PP1 Same model as PD1 -- -- -- -- -- -- Empirically not identified
PP2 As PP1: Loadings PD-On = Loadings PD-Off = Loadings PSP 1949 930 0.070 0.97 0.97 0.09 Baseline model 95% Confidence Interval of RMSEA: 0.065 – 0.075
PP3 As PP2: Also factor correlation matrices equal1 2376 972 0.081 0.89 0.90 0.22 Outside confidence limits PP2
PP4 As PP3: In PSP all factor (co)variances related to the factor Tremor estimated rather than set equal to those of the PD groups 2099 966 0.073 0.96 0.97 0.14 Within confidence limits of PP2 Preferred model
  1. 1The model modification indices of the factor variance for Tremor-at-rest were moderately large to large (PSP: 70; PD-On: 19; PD-Off : 12) indicating that the common values were not very accurate for these variances, suggesting separate estimations of these quantities. RMSEA = Root mean square residual, CFI = comparative fit index, TLI = Tucker-Lewis Index, St.RMR = standardised root mean residual correlation.