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Why we square: variance, sums of squares and n − 1

Why spread formulas square deviations, variance s² and σ², sums of squares split into between and within, λ as a sum of squared loadings, and the idea behind n − 1 and degrees of freedom.

Lesson 13 of 36~28 min of learningIncludes ~15 min for questions and tasks

Read the theory (8 cards)
Dots around a central line, each linked by a stick that grows into a square tile, the largest tile orange.