Statistics Calculators (Page 4)

Mean, probability, distributions, hypothesis testing and more.

Compute SE = √(p(1−p)/n) for a sample proportion.

Compute risk difference RD = p₁ − p₂ between two groups.

Compute NNT = 1/|p₁ − p₂| from two event rates.

Compute positive likelihood ratio LR⁺ = sens / (1 − spec).

Compute negative likelihood ratio LR⁻ = (1 − sens) / spec.

Compute Youden's J = sens + spec − 1.

Compute F1 = 2PR / (P + R) from precision and recall.

Compute incidence rate = cases / person-time.

Compute prevalence = existing cases / total population.

Compute diagnostic odds ratio DOR = LR⁺ / LR⁻ from sensitivity and specificity.

Compute PPV = sens·prev / (sens·prev + (1−spec)(1−prev)).

Compute NPV = spec(1−prev) / ((1−sens)prev + spec(1−prev)).