“…However, whether the associated cost saving is large is unclear, especially in the light of the evidence on the typical length of an IMS in Tables 1 and 2. Before we test H2 and H3, we compare, in Table 4, abnormal return variability and abnormal trading volume associated with first-and third-quarter IMSs against abnormal return variability and abnormal trading volume associated with interim results and preliminary earnings announcements. For that we follow prior research, including Beaver (1968), Landsman and Maydew (2002), DeFond et al (2007) and Landsman et al (2012), and measure abnormal return variability as the ratio of the event window return variability to the non-event window return variability. Specifically, we start by calculating daily market-model adjusted returns, u it , as: where R it is the return of firm i on day t and R Mt is the return of the FTSE All Share Index on day t and where R it and R Mt are calculated from Datastream Return Indices, RI.…”