The basis for the quantitative analysis is not explained, except that it was performed "by the author." I assume that it would be very difficult to quantify suc

The basis for the quantitative analysis is not explained, except that it was performed "by the author." I assume that it would be very difficult to quantify such a slippery concept as human problem-solving ability. It would be hard for me to trust this analysis without more information about where the numbers come from.