Notes on Non-GAAP Financial Measures
Tower uses non-GAAP financial measures in this press release to assist investors in analyzing the company's operating performance for the periods presented herein. Because Tower's calculation of these measures may differ from similar measures used by other companies, investors should be careful when comparing Tower’s non-GAAP financial measures to those of other companies. Definitions and calculations of other financial measures used in this press release can be found in the footnotes below.
(1) Operating income (loss) excludes realized gains and losses, acquisition-related transaction costs and the results of the reciprocal business, net of tax. Operating income is a common measurement for property and casualty insurance companies. We believe this presentation enhances the understanding of our results of operations by highlighting the underlying profitability of our insurance business. Additionally, these measures are a key internal management performance standard. Operating earnings (loss) per share is operating income (loss) divided by diluted weighted average shares outstanding. Net income (loss) attributable to Tower Group, Inc. is the most directly comparable GAAP measure. Operating return on equity is annualized operating income (loss) divided by average common equity, and operating return on equity excluding the impact of catastrophes and reserve development is calculated by eliminating the impact of catastrophes and reserve development on operating income (loss). See footnote 2 for additional discussion of the exclusion of catastrophes and reserve development. A reconciliation of net income (loss) attributable to Tower Group, Inc. to operating income (loss) and return on average equity to operating return on average equity is provided in an accompanying table.
(2) Combined ratio excluding the impact of catastrophes and reserve development is the sum of the loss and loss adjustment expense ratio and the expense ratio excluding the impact of catastrophes and reserve development. We believe this presentation enhances the understanding of our results by eliminating what we believe are volatile and unusual events and presenting the ratios with what we believe are the underlying run rates of the business. A reconciliation of combined ratio to combined ratio excluding the impact of catastrophes and reserve development is provided in an accompanying table.
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