Scores obtained by one method aren't equivalent to scores obtained by the other method.
Yes, but for IQs near 100 the ratio and deviation measures are close. The ratio measure came first, and the deviation measure was calibrated with a standard deviation of 15 or 16 in order to approximate the ratio measure. According to a
http://hiqnews.megafoundation.org/Deviation_IQs.html some equivalences are
ratio_IQ deviation_IQ
120 119
130 128
140 136
150 143
160 150
I would like to know if published research confirms or disagrees with these numbers.
