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Table 5 Principal component analysis of the residuals and comparisons with simulated data

From: Adaptation of Chinese and English versions of the Ankylosing Spondylitis quality of life (ASQoL) scale for use in Singapore

  Observed data Simulated data 1 Simulated data 2
Total raw variance in observations 100% 100% 100%
Raw variance explained by Rasch model 37.2% 38.8% 38.4%
Raw variance explained by persons 16.1% 17.4% 16.8%
Raw variance explained by items 21.1% 21.3% 21.5%
Raw unexplained variance (total) 62.8% 61.2% 61.6%
Unexplained variance in first contrast in Eigenvalue, (%) 2.077 (7.2%) 1.67 (5.7%) 1.69 (5.8%)