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Table 2 Model selection: Parkinson disease only: PD-On-Group and PD-Off- Group

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

Model Description χ2 df RMSEA TLI CFI St.RMR Comments
PD1 Six factors based on component solutions -no constraints across groups; correlated residuals Facial and Speech 1318 592 0.071 .92 .93 0.08 BASELINE MODEL with 95% confidence interval of RMSEA: 0.065 – 0.077
PD2 As PD1: Within a factor all loadings equal 1578 634 0.078 .90 .91 0.10 Outside interval. PD2; too simple
PD3 As PD1: Loadings PD-On = Loadings PD-Off 1377 613 0.071 .92 .93 0.07 Simpler model than PD2
PD4 As PD3: Also equal factor covariance matrices 1450 634 0.072 .92 .92 0.09 Preferred model: Very simple; easy interpretation;
PD5 As PD4: Also residual variances and residual covariances equal across groups 2497 674 0.100 .82 .83 0.13 Rejected: Oversimplification
  1. Note: RMSEA = Root mean square residual, CFI = comparative fit index, TLI = Tucker-Lewis Index, St.RMR = standardised root mean residual correlation.