Abstract Examines risk, return and abnormal return behavior in the days around quarterly earnings announcements, using a research design that allows risk to vary daily in event time. Result of the tests conducted on several hypotheses concerning the effect on security prices of earnings announcements; Investigation whether cross-sectional variation in announcement-period risks and returns is a function of firm size.

Reviews the book "Management Decision Making Under Uncertainty: An Introduction to Probability and Statistical Decision," by T.R. Dyckman, S. Smidt and A.K. McAdams.

ABSTRACT We quantify the relative importance of earnings announcements in providing new information to the share market, using the R 2 in a regression of securities' calendar‐year returns on their four quarterly earnings‐announcement “window” returns. The R 2 , which averages approximately 5% to 9%, measures the proportion of total information incorporated in share prices annually that is associated with earnings announcements. We conclude that the average quarterly announcement is associated with approximately 1% to 2% of total annual information, thus providing a modest but not overwhelming amount of incremental information to the market. The results are consistent with the view that the primary economic role of reported earnings is not to provide timely new information to the share market. By inference, that role lies elsewhere, for example, in settling debt and compensation contracts and in disciplining prior information, including more timely managerial disclosures of information originating in the firm's accounting system. The relative informativeness of earnings announcements is a concave function of size. Increased information during earnings‐announcement windows in recent years is due only in part to increased concurrent releases of management forecasts. There is no evidence of abnormal information arrival in the weeks surrounding earnings announcements. Substantial information is released in management forecasts and in analyst forecast revisions prior (but not subsequent) to earnings announcements.

ABSTRACT We investigate the role of accrual accounting in the asymmetrically timely recognition (incorporation in reported earnings) of gains and losses. Timely recognition requires accruals when it precedes complete realization of the gains and losses in cash. We show that nonlinear accruals models incorporating the asymmetry in gain and loss recognition (timelier loss recognition, or conditional conservatism) offer a substantial specification improvement, explaining substantially more variation in accruals than equivalent linear specifications. Conversely, conventional linear accruals models, by omitting the loss recognition asymmetry, exhibit substantial attenuation bias and offer a comparatively poor specification of the accounting accrual process. Linear specifications also understate the ability of current earnings to predict future cash flows. These findings have implications for our understanding of accrual accounting and conservatism, as well as for researchers estimating discretionary accruals, earnings management, and earnings quality.

Value relevance, Accounting, Earnings announcements, Usefulness of Accounting