“…Many other studies have also employed the linear regression to model these count variables (Ajiferuke, 2005;Ayres & Vars, 2000;Bornmann & Daniel, 2007;Habibzadeh & Yadollahie, 2010;Landes & Posner, 2000;Lokker, McKibbon, McKinlay, Wilczynski, & Haynes, 2008;Peters & van Raan, 1994;Vaughan & Thelwall, 2005;Willis et al, 2011;Xia, Myers, & Wilhoite, 2011;Yoshikane, Suzuki, Arakama, Ikeuchi, & Tsuji, 2013;Yu, Yu, Li, & Wang, 2014). However, negative binomial regression models, which are a type of count regression models, have been used in a very few informetric studies (Baccini, Barabesi, Cioni, & Pisani, 2014;Chen, 2012;Didegah & Thelwall, 2013;Lee, Lee, Song, & Lee, 2007;McDonald, 2007;Thelwall & Maflahi, 2015;Walters, 2006;Yoshikane, 2013;Yu & Wu, 2014).…”