“2013 Lewis Meditation Results”, 2013-07-12 (; backlinks):
Multilevel modeling of effect of small group’s meditation on math errors
A small group of Quantified Selfers tested themselves daily on arithmetic and engaged in a month of meditation. I analyze their scores with a multilevel model with per-subject grouping, and find the expect result: a small decrease in arithmetic errors which is not statistically-significant, with practice & time-of-day effects (but not day-of-week or weekend effects). This suggests a longer experiment by twice as many experimenters in order to detect this effect.