Colin Jacobson
Senior HTF Member
- Joined
- Apr 19, 2000
- Messages
- 13,328
I thought the scale was shifted higher than that. I didn't realize that 100 was the pre-chosen median score. My memory had the scale shifted upward somewhat as I thought the impared levels began around 90, which is wrong of course.
What DOES happen is that older tests become less representative of the average. For example, as a school psychologist I commonly use the Wechsler Intelligence Scale for Children - Third Edition (WISC-III). When it came into use about a decade ago, it started to replace the WISC-R, which had been normed many years earlier. Contrary to popular belief, IQs have slowly gone up over the years, so a 100 on the WISC-III is generally tougher to get than a 100 on the WISC-R. When retested on the WISC-III, kids tended to score a bit lower than they did on the WISC-R.
The older the test, the more pronounced the difference. As such, what earns a 100 today would have gotten something higher 20 years ago, but by definition, 100 remains average...
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Colin Jacobson
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