“…For example, one frequently considered factor is the presence (or absence) of mental illness (Dutton et al, 2013; Fox & Fridel, 2016; Gill et al, 2017; Lankford & Cowan, 2020; Metzl & MacLeish, 2015; Vossekuil et al, 2002). The spectrum of factors considered also includes criminal histories (DeLisi & Scherer, 2006; DeLisi & Walters, 2011), fame-seeking behaviors (Lankford, 2016; Silva & Greene-Colozzi, 2019b), illegal drug use (Miller et al, 2020), masculinity norms (Kalish & Kimmel, 2010; Madfis, 2014; Silva et al, 2021), and contagion and copycat effects (Boyd & Molyneux, 2021; Lankford & Tomek, 2018; Towers et al, 2018). Findings from these studies are commonly couched in terms of frequencies.…”