Geometric Mean and Spread Explorer
Summarize fictional positive observations with a geometric mean and multiplicative geometric SD factor.
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Calculation results
Count: 3
Geometric mean: 2
Geometric SD factor: 2
Mean log: 0.693147; sample SD log: 0.693147
Assumptions and limits
Geometric mean = exp(mean(ln x)); geometric SD = exp(sample SD of ln x), using n−1. Geometric SD is a dimensionless multiplicative factor, not an additive SD, confidence interval or standard error. Requires 2–200 strictly positive values in the same units, each from 1e-100 to 1e100. No zero replacement or missing-value deletion. Lognormal interpretation requires a separate distribution check; this summary does not prove lognormality.
SciPy: geometric mean · Read the practical guide · Download blank worksheet (TXT)