Calculating Seasonality [BEST]

Once you have calculated your indices, you will have a set of numbers usually centered around the number 1 (or 100, depending on formatting).

If the average ratio for December is 1.25, your December Seasonal Index is 125. This means December sales are typically 25% higher than the average month. calculating seasonality

Most modern business data follows a multiplicative model. Once you have calculated your indices, you will