“…The polynomial model and the power model have typically been used in previous applications of modeling continuous endpoints (Crump, 1984;Allen et al, 1994aAllen et al, , 1996Allen et al, , and 1998Kavlock et al, 1995;Barton and Das, 1996;Haber et al, 1998;Gephart et al, 2001;Crump, 1995Crump, , 2002. Table 2 also includes the Hill function which has received attention in more recent applications relating to the risk assessment of chemicals and BMD analysis (Barton et al, 1998;Murrell et al, 1998;Zhou et al, 2001Zhou et al, , 2002Kim et al, 2002;Gaylor and Aylward, 2004;Sand et al, 2004Sand et al, , 2006Toyoshiba et al, 2004;USEPA, 2007). In addition, an exponential model is also given in Table 2.…”