“…Evaluation bias or process changes are of particular concern to researchers if these are correlated with the researchers' key explanatory variables. A few researchers have devised clever ways to check for evaluation bias related to their particular question (Dreher et al 2013) but it is 1 Outsider papers includes Buntaine and Parks (2013), Dreher et al (2013), Girod and Tobin (2011), Kilby (2015), Malik and Stone (2016), Michaelowa and Borrmann (2006), Sud and Olmstead-Rumsey (2012), and Winters (2014). Insider papers include Blum (2014), Bulman et al (2015), Chauvet et al (2010), Chauvet et al (2015), Cruz and Keefer (2013), Deininger et al (1998), Denizer et al (2013), Dollar and Levin (2005), Dollar and Svensson (2000), Geli et al (2014), Guillaumont and Laajaj (2006), Isham and Kaufmann (1999), Isham et al (1997), Kaufmann and Wang (1995), Limodio (2011), Malesa and Silarszky (2005), Moll et al (2015), Pohl et al (1992), Ralston (2014) and Smets et al (2013).…”