The FORECAST.ETS.CONFINT function in Excel is used to calculate the confidence interval for a forecasted value based on a time series. It provides an estimate of the range within which the actual value is likely to fall, considering the volatility and uncertainty of the data.


=FORECAST.ETS.CONFINT(target_date, values, data, probability, confidence_interval)

target_date The date for which you want to forecast a value.
values The array or range of known values in the time series.
data The array or range of known timeline values corresponding to the values.
probability The probability used to calculate the confidence interval (between 0 and 1).
confidence_interval The confidence level percentage for the interval (between 0 and 1).


In the realm of time series forecasting, the FORECAST.ETS.CONFINT function emerges as a crucial tool within Excel's arsenal. By leveraging this function, users gain the ability to not only predict future values based on historical data but also assess the uncertainty surrounding these predictions through confidence intervals. This feature equips analysts and researchers with valuable insights into the reliability of their forecasts, aiding in informed decision-making processes and risk management strategies. The confidence interval represents a band within which the actual value is likely to lie, encompassing the inherent variability and potential deviations from the predicted outcome. In essence, FORECAST.ETS.CONFINT serves as a beacon of probabilistic guidance, illuminating the path forward amidst the uncertainties of time-driven data manipulation.


Suppose you have a dataset containing historical stock prices for a particular company. You want to forecast the stock price for a specific date in the future and provide the confidence interval. By using the FORECAST.ETS.CONFINT function with the relevant parameters, you can generate a forecast along with the associated confidence interval, offering a comprehensive outlook on the potential range of the estimated value.


How does the FORECAST.ETS.CONFINT function contribute to time series forecasting?

The FORECAST.ETS.CONFINT function enhances time series forecasting by incorporating confidence intervals into the predicted values. This inclusion offers a probabilistic outlook on the anticipated range within which the actual value is likely to fall, enriching the forecasting process with uncertainty assessment and risk evaluation.

What role does the probability parameter play in the FORECAST.ETS.CONFINT function?

The probability parameter in the FORECAST.ETS.CONFINT function determines the probability level used to calculate the confidence interval. By adjusting this value within the permissible range of 0 to 1, users can customize the confidence assessment to suit their forecasting needs and risk tolerance.

Can the confidence interval percentage be modified in the FORECAST.ETS.CONFINT function?

Yes, users can adjust the confidence level percentage for the interval by specifying the desired value in the confidence_interval parameter. This customization empowers individuals to tailor the width and significance of the confidence interval based on the specific forecasting scenario and decision-making requirements.

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