Statistics calculators

Weighted arithmetic mean using your explicit nonnegative weights. Scientific equation with no inferred weighting scheme.

Unweighted middle ordered observation or average of the two middle values. Scientific descriptive statistic.

Estimated standard error of mean s/sqrt(n) for independent observations. Distinct from individual observation spread.

Two-sided Student t interval for a population mean with unknown variance. Enter confidence level explicitly; assumptions stated.

Standardized score from your entered mean and standard deviation. No normal distribution or medical risk inferred.

Absolute reference-relative error using the accepted reference magnitude. Zero reference is undefined.

Symmetric mean-normalized difference between nonnegative peer measurements. Distinct from reference-relative error.

Unweighted ordinary least-squares line with intercept, slope and R-squared. No causal or clinical inference.

Pearson product-moment linear correlation of paired observations. No significance test or causation claim.

GUM first-order uncorrelated uncertainty budget with entered sensitivities and coverage factor. Coverage probability is not inferred.