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Collect at least 3–5 years of data for the same period (e.g., monthly or quarterly).
📌 Example: If January’s average sales are 120 and the overall monthly average is 100, the seasonal index = 1.2 (20% above average).
Find the average value for each season (e.g., average of all Januaries).
Here’s a clear, professional post you can use for LinkedIn, a blog, or a social media update:
Want to go deeper? Use Excel, Python ( statsmodels ), or R for advanced decomposition (additive or multiplicative).
Calculate the grand mean of all data points across all periods.
Seasonal indices help you uncover repeating patterns in your data — whether it’s sales, web traffic, or demand. Here’s how to calculate them step by step:
