Updated: May 2, 2019
This function uses two sets of values to predict a single value.The predicted value is based on the relationship between the two original sets of values.If the values are sales figures for months 1 to 6, (Jan to Jun), you can use the function to predict what the sales figure will be in any other month.
The way in which the prediction is calculated is based upon the assumption of a Linear Trend.
ItemToForecast is the point in the future, (or past), for which you need the forecast.
RangeY is the list of values which contain the historical data to be used as the basis of the forecast, such as Sales figures.
RangeX is the intervals used when recording the historical data, such as Month number.
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