“…Thus, a total of 27 effect sizes were ultimately regressed onto the various study attributes. Overall, 8 effect sizes were coded as 0 (Bailey, 1967/1968; Bledsoe & Layser, 1977; Chambers & Ficek, 1970; Geitgey, 1966; Katz & Schwebel, 1976; Norton, 1973; Selfridge et al, 1975; Shapiro & Ross, 1971), and 19 were coded as 1 (Avery, 1978; Bledsoe & Layser, 1977; Dua, 1971; Evans, Uhlemann, & Hearn, 1978; Fraser & Vitro, 1975; Heck, 1971; Holder & Hicks, 1977; Kennelly, 1981; Long et al, 1978; Mendelsohn, 1978; Norton, 1973; Quirk, 1976; Rennie, Brewster, & Toukmanian, 1985; Selfridge et al, 1975; Tosi & Eshbaugh, 1978; Toukmanian & Rennie, 1973; Vogelsong, 1978; Waldo, 1989; Woodburn, 1976/1977).…”