Go to the Data tab > Forecast group and click the Forecast Sheet button.In most cases, it is sufficient to select just one cell in any of your series, and Excel picks up the rest of the data automatically. With the two data series in place, carry out the following steps to build a forecasting model: However, these are fully-functional dates, not text values. ![]() Please pay attention that column A contains dates (the 1st of every month) in a custom format that displays only the month and year. In this example, we will try to forecast sales for the next few years based on the following historical data. However, it is recommended to summarize your data to get more accurate predictions. In theory, your time series can miss up to 30% of data points or have several entries with the same date or time, and Excel will still do the forecast correctly. For example, you can supply weekly intervals with values on every Monday, monthly intervals with values on the 1st day of every month, etc. It is important that your time series have equal intervals between the data points.
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