“…Of course, gamma can be used for metric data as well, since it is a more conservative measure than r. Moreover, one could use Kim's d xy when ties on the judgments are not forced by the procedure of data collection (Gonzalez & Nelson, 1996). Nevertheless, all of the measures have been used in past research with confidence judgments-for example, bias (see, e.g., Maki, 1998) and absolute bias (e.g., Nietfeld & Schraw, 2002) as measures of absolute accuracy, and Pearson's r (e.g., Glenberg, Sanocki, Epstein, & Morris, 1987), gamma (e.g., Dunlosky, Rawson, & Middleton, 2005), and d (e.g., Tobias & Everson, 2000) as measures of relative accuracy. Measures of absolute accuracy in particular are favored by researchers working in classroom settings (see, e.g., Hacker, Bol, & Bahbahani, 2008;Nietfeld, Cao, & Osborne, 2005).…”