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Table 3 PCARs of Qiyas for L1 Arabic language test data

From: Investigating the psychometric properties of the Qiyas for L1 Arabic language test using a Rasch measurement framework

Standardized residual variance (in Eigenvalue units)   Observed (%)   Expected (%)
Total raw variance in observations 59.4 100.00   100.00
Raw variance explained by measures 14.4 24.20   24.30
Raw variance explained by persons 6.1 10.30   10.40
Raw variance explained by items 8.3 13.90   13.90
Raw unexplained variance (total) 45 75.80 100.00 75.70
Unexplained variance in first contrast 2.3 3.80 5.00  
Unexplained variance in second contrast 1.9 3.30 4.30