Finance and Business
Cumulative Abnormal Return Calculator
Cumulative Abnormal Return Calculator calculate period abnormal returns and cumulative abnormal return from paired actual and expected return series.
Finance and Business
Cumulative Abnormal Return Calculator
Calculate period abnormal returns and cumulative abnormal return from paired actual and expected return series.
Formula
Abnormal return_t = actual return_t - expected return_t; CAR = sum of abnormal returns across the event window.
About the Cumulative Abnormal Return Calculator
Calculate period abnormal returns and cumulative abnormal return from paired actual and expected return series.
How the Cumulative Abnormal Return Calculator Works
Paired percentage returns are subtracted period by period, checked for equal length, and summed without compounding because event-study CAR is an additive measure.
Formula
Abnormal return_t = actual return_t - expected return_t; CAR = sum of abnormal returns across the event window.
The calculation runs in your browser. Values are validated for required ranges, compatible units, and method-specific restrictions before results are displayed.
Required Inputs
- Actual period returns (required).
- Expected period returns (required).
Results Reported
The result panel reports the final answer and the intermediate quantities needed to check the calculation:
- Cumulative abnormal return (%)
- Average abnormal return (%)
- Period abnormal returns
- Event-window periods
- Largest absolute abnormal return (%)
Cumulative Abnormal Return Calculator Example
Select Example Data in the calculator to load this reproducible input set:
| Input | Example value |
|---|---|
| Actual period returns | 1.2, -0.5, 2.1, 0.7 |
| Expected period returns | 0.8, -0.2, 1.0, 0.4 |
How to Use the Calculator
- Confirm that the calculator title and formula match the quantity you need.
- Enter every required value using the unit shown with its field.
- Select Example Data to inspect a valid input set, or enter your own values and select Calculate.
- Review all reported values and the displayed formula before using the answer.
- Use Copy Result or Download CSV when you need a reusable record.
Accuracy and Limitations
Expected-return model choice, estimation window, event leakage, overlapping events, heteroskedasticity, and statistical significance require a complete event-study design.
Keep units consistent, use measurements that represent the actual situation, retain full precision during the calculation, and round only the final answer. Professional decisions may require current official rules, field measurements, laboratory methods, or specialist review.
Frequently Asked Questions
What does the Cumulative Abnormal Return Calculator calculate?
Calculate period abnormal returns and cumulative abnormal return from paired actual and expected return series.
Which formula does the Cumulative Abnormal Return Calculator use?
Abnormal return_t = actual return_t - expected return_t; CAR = sum of abnormal returns across the event window. Paired percentage returns are subtracted period by period, checked for equal length, and summed without compounding because event-study CAR is an additive measure.
What should I check before using the Cumulative Abnormal Return Calculator result?
Expected-return model choice, estimation window, event leakage, overlapping events, heteroskedasticity, and statistical significance require a complete event-study design.