“…In this section, we use two non-market based measures that have also been used in the literature for M&A quality: (1) post-acquisition change in ROA, ∆ROA, (Healy et al, 1992;Chen et al, 2007;Wang and Xie, 2009;Lin et al, 2011;Fu et al, 2013;Goodman et al, 2014), and (2) the probability of a post-acquisition goodwill impairment, Prob_GW_Impair (Doellman and Ryngaert, 2010;Gu and Lev, 2011;Goodman et al, 2014). The advantages of these measures are that they are not as susceptible to market biases and they represent ex post (as 22 Our results are robust if we define short-tenured auditor as the ones whose tenure is less than or equal to one year prior to deal announcement.…”