 However, she found no statistically significant differences on the other measures, although she stated that on those measures "ELAC performed at higher levels than Arrowsmith, often by a relatively large amount".Howard Eaton has stated that there were multiple problems with the design, sampling, and statistical analysis in Siegel's study, something which Siegel has also conceded.In 2013 Eaton co-authored a re-analysis of Siegel's data with professors William Lancee and Darren Irwin.