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Table 7 GeDI item difficulty rank in initial and present administrations

From: Testing validity inferences for Genetic Drift Inventory scores using Rasch modeling and item order analyses

Items addressing key concepts Items addressing misconceptions
Price et al. (2014) Present study Price et al. (2014) Present study
16 16 8 8
13 13 6 6
10 3 12 14
4 10 17 12
15 15 5 17
3 4 14 5
1 1 2 2
   11 19
   18 22
   20 20
   9 9
   7 7
   19 11
   22 21
   21 18
  1. Items listed from most challenging items (top) to least challenging items (bottom). Difficulty rank based on CTT difficulty (P) values for initial study and Rasch item measures for present study