Multi-factor SUR in event study analysis: evidence from M&A in Singapore's financial industry

Enrico Tanuwidjaja

Applied Financial Economics Letters, 2007, vol. 3, issue 1, pages 55-62

Abstract: This paper proposes a use of multi-factor seemingly unrelated regression (SUR) in event study analysis to study mergers and acquisitions in Singapore's financial industry. We also study the cross-sector (banking and insurance) domestic acquisitions in Singapore's financial industry. In contrast to the use of ordinary least squares (OLS) method, it is found that OLS method seems to underestimate the value of the sample cumulative abnormal returns as compared to SUR. The study also found that firms post mergers and takeovers in the banking and insurance industries tend to have high a possibility of negative returns.

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