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Old 01-25-2017, 12:12 PM
Bowzo Bowzo is offline Forecast Sheet Windows 10 Forecast Sheet Office 2016
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I am doing a time series forecast via the Forecast Sheet and I have a question regarding seasonality. Under "Detect Automatically", which is the default, how is seasonality automatically determined? If my time series is at a consistent interval of 2 weeks, is Excel reading it as 14 days or the number of bi-weekly subsets exist before the next time series?
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Old 01-26-2017, 08:33 AM
gebobs gebobs is offline Forecast Sheet Windows 7 64bit Forecast Sheet Office 2010 64bit
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Here is what Microsoft says about the topic in this article about Forecast Sheet.

Quote:
Seasonality is a number for the length (number of points) of the seasonal pattern and is automatically detected. For example, in a yearly sales cycle, with each point representing a month, the seasonality is 12. You can override the automatic detection by choosing Set Manually and then picking a number.

NOTE: When setting seasonality manually, avoid a value for less than 2 cycles of historical data. With less than 2 cycles, Excel cannot identify the seasonal components. And when the seasonality is not significant enough for the algorithm to detect, the prediction will revert to a linear trend.
Does that help at all?
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