Elena ran a small ice cream shop called "The Frosty Swirl" on the boardwalk of a beach town. Her summers were a glorious whirlwind of waffle cones and long lines. Her winters, however, were a ghost story of creaking floorboards and heating bills.
And every year, she recalculated the indices using the latest three years of data, because seasons shift. A new boardwalk hotel opened, boosting spring sales. Her Spring Index crept up from 0.99 to 1.10. how to calculate seasonal variation
"That’s my overall average per season," she said. Elena ran a small ice cream shop called
Leo grabbed a clean napkin and a pen. "You need to calculate seasonal variation. It’s how you separate the 'normal rhythm' of your business from the 'random noise' of life. It takes four steps. Let's use your sales data." And every year, she recalculated the indices using