Hierarchy of WJ-IV scores (Mather & Wendling, 2014).
{"Image DocumentName": "Hierarchy of WJ-IV scores (Mather & Wendling, 2014).", "Image ImageDescription": "Level 3-Proficiency: W scores and W difference scores. A W score reflects a probability that the individual will get 50% of the items correct and 50% of items incorrect. So a student who earns a W score of 500 gets a grade equivalent of 5.0. The average individual at that grade level with a proficiency at W of 500 would likely get half of the items correct and half of the items incorrect. 50% of items correct would not suggest proficiency. The authors move proficiency to 90% proficient. Therefore, based on the difficulty of the items, it is figured out which W score a student would need to get 90% of the items correct. For example, for an average 5.0 student, perhaps it\u2019s a W score of 450 (I\u2019m just making this up but let\u2019s use this number). Now, let\u2019s assume you\u2019re evaluating a student in grade 5.0. You want to determine how proficient your examinee would be against the average 5.0 would be with a W difficulty for getting 90% correct. This means the Reference W would be 450 (not 500 as that is only 50% proficiency.)", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}