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Table 3 Correlations between Rasch student ability estimates for the LPDI items by tier and content

From: Is it harder to know or to reason? Analyzing two-tier science assessment items using the Rasch measurement model

Dimension   ( A ) ( B ) ( C )
Tier 1 × Light Propagation ( A )    
Tier 1 × Visibility ( B ) 0.55   
Tier 2 × Light Propagation ( C ) 0.72 0.42  
Tier 2 × Visibility ( D ) 0.56 0.92 0.44
  1. Note. The correlations shown are between the estimates of students’ ability for the respective combination of tier and content