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Figure 1 | BMC Neurology

Figure 1

From: Item response theory-based measure of global disability in multiple sclerosis derived from the Performance Scales and related items

Figure 1

Unidimensional CFA model of self-assessed neurological disability in NARCOMS registrants. Note: “Disability” represents a latent factor, i.e., a not directly observable continuous variable whose scale is inferred from the variability and correlations among PS. “PS-factor correlations” are estimates of the correlations between PS and factor scores. “Residual variances” represent the fractions of PS score variability that are not explained by the factor.

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