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Principal component analysis of the residuals and comparisons with simulated data
| 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%) |
