ACF5130 Chap.3 Return Measures and Event Analysis
Return Measures and Event Analysis
Return Measures and Event Analysis separates four numerical questions. Share return measures the investor's period gain and can include dividends. Market-adjusted return subtracts a broad index. Abnormal return subtracts a model-based expected return to isolate an event-window signal. The Sharpe ratio evaluates excess return per unit of volatility.
The chapter emphasises sign discipline, visible substitutions, benchmark language and limitations on causal claims. Numerical accuracy is only the first checkpoint. Each result must identify its horizon, comparison and economic meaning. Event analysis also requires a clean distinction between an association around an announcement and proof that the announcement caused the move.
Students examine confounding news, estimation assumptions and overlapping events before attaching confidence to an interpretation. By keeping raw, benchmark-adjusted, model-adjusted and risk-adjusted measures separate, the chapter prevents one percentage from answering a question it was not designed to answer.
What this chapter covers
- 01
Share return calculation
- 02
Market benchmark return
- 03
Market-adjusted return
- 04
Expected return model
- 05
Abnormal event return
- 06
Sharpe ratio interpretation
Worked example · free
Compute market-adjusted and abnormal returns
- +2Share return = ($42.00 - $40.00 + $0.50) divided by $40.00 = 6.25%.
- +2Market-adjusted return = 6.25% - 3.00% = +3.25%, showing period outperformance against the index.
- +2Expected event return = 0.2% + 1.1 times -1.0% = -0.9%.
- +2Abnormal return = -2.4% - (-0.9%) = -1.5%, showing event-window underperformance relative to expectation.
Key terms
- Share Return
- Share return is the price change plus any dividend, divided by the opening share price.
- Market Return
- Market return is the proportional change in a broad market index over the same period.
- Market-Adjusted Return
- Market-adjusted return is company return minus market return and measures broad relative performance.
- Expected Return
- Expected return is the model benchmark implied by alpha, beta and the observed market movement.
- Event Window
- An event window is the selected period over which the price response associated with an event is measured.
- Sharpe Ratio
- The Sharpe ratio is excess return over the risk-free rate divided by return volatility.
Return Measures and Event Analysis FAQ
What is the main difference between market-adjusted and abnormal return?
Market-adjusted return simply subtracts the broad market return and answers whether the share beat its benchmark. Abnormal return subtracts a model-based expected return, often incorporating beta, to isolate a more specific event-window signal.
Why include dividends in share return?
Dividends transfer value to the investor during the holding period. Ignoring them understates total return when a dividend is paid, so the price change and dividend should be combined when the data and question require it.
Does a negative abnormal return prove an event caused the fall?
No. It supports an event-window association after controlling for expected movement, but the analyst should still examine overlapping announcements, information leakage, the chosen window and sensitivity to the expected-return model.
Assessment move
Write the four formulas on separate cards and add the question each formula answers. Recompute examples with the formula, substituted numbers, percentage units and sign visible on every line. Spend extra time subtracting negative expected returns because a missing parenthesis changes the answer. After calculation, write one sentence naming the benchmark, time window and direction. Then add one limitation.
For event studies, distinguish association from causation and check overlapping news. For the Sharpe ratio, remember that the numerator is excess return and the denominator is volatility; a lower raw return can still produce a higher risk-adjusted result. Mix numerical and interpretive practice so the calculation never becomes detached from the valuation question. Build a sign ledger before touching the calculator.
Record opening and closing prices, dividend, market move, alpha, beta and actual return with explicit positive or negative signs. Estimate the expected direction before computing so an implausible result prompts a check. Practise the same data through different questions: first find raw return, then market-adjusted return, then change to a short event window and calculate abnormal return.
Explain why the answers cannot be compared without their horizons. For Sharpe exercises, rank funds once by raw return and again by the ratio, then identify the role of the risk-free rate and volatility in any reversal. Maintain a small error log for lost dividends, wrong denominators, percentage-point confusion and subtraction of negative values. Redo each logged error with new numbers.
After every numerical answer, add a compact evidence sentence and a limitation sentence. This produces the calculation-plus-interpretation form used in the course solutions and stops a correct percentage from becoming an unsupported causal conclusion.
Working through Return Measures and Event Analysis in ACF5130? Sia is AskSia’s AI Accounting tutor — ask any ACF5130 Return Measures and Event Analysis question and get a clear, step-by-step explanation grounded in how ACF5130 is taught and assessed. Read this chapter free, then take your hardest questions to Sia.
