Examining Legibility of the Letter "e" and Number "0" Using Classification Tree Analysis
http://www.surl.org/usabilitynews/92/legibility.asp

Fox, Doug, Barbara S. Chaparro and Ed Merkle
Usability News
2007

Abstract:

This study investigated the legibility of onscreen typefaces and the influence of individual character features on correct identification. Specific attributes of alphanumeric characters and symbols shown to be the least legible were measured and analyzed using a statistical method called classification tree analysis. Results from this analysis for the letter "e" and the number zero are discussed.