Deviation: each value minus the mean (xi − μ or xi − x̄).
SSD: sum of squared deviations = Σ(xi − mean)².
Population variance (σ²): SSD ÷ n (use when your data is the whole population).
Sample variance (s²): SSD ÷ (n − 1) (unbiased estimator when data is a sample).
Std. deviation: square root of variance (σ or s).
Requirements: population variance needs n ≥ 1; sample variance needs n ≥ 2.
Delimiters: commas, spaces, or new lines are fine (decimals & scientific notation supported).
Notes & tips
Non-numeric tokens are ignored; ensure you don’t include headers or labels in pasted data.
For very large n or large magnitudes, SSD and variance can grow quickly—this is expected.
If you need weighted variance, we can add a weights field in a future version.
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