Calculators and data tools for analysts

Standard Error Calculator

Calculate standard error with guided inputs, visible equations, substituted working, and model assumptions.

Standard Normal Density Calculator

Calculate standard normal density with guided inputs, visible equations, substituted working, and model assumptions.

Statistical Power Calculator

Create a bounded, browser-local statistical power calculator with visible assumptions, review guidance, and downloadable output.

Stirling Number Second Kind Calculator

Count partitions of labelled elements into exactly k nonempty unlabeled blocks.

Sum of Positive Divisors Calculator

Sum every positive divisor through exact prime-power geometric factors.

Surjective Function Count Calculator

Count onto functions between supplied labelled finite sets.

Survey Logic Planner

Create a bounded, reviewable survey logic planner from supplied research facts without collecting data, inferring findings, or claiming causality.

Survey Question Builder

Create a bounded, browser-local survey question builder with visible assumptions, review guidance, and downloadable output.

Survey Response Rate Calculator

Create a bounded, reviewable survey response rate calculator from supplied research facts without collecting data, inferring findings, or claiming causality.

TAM SAM SOM Calculator

Create a bounded, browser-local tam sam som calculator with visible assumptions, review guidance, and downloadable output.

Thematic Analysis Template

Create a bounded, browser-local thematic analysis template with visible assumptions, review guidance, and downloadable output.

Torus Volume Calculator

Calculate torus volume with guided inputs, visible equations, substituted working, and model assumptions.

Trapezoid Area Calculator

Calculate trapezoid area with guided inputs, visible equations, substituted working, and model assumptions.

Triangle Circumradius Calculator

Calculate triangle circumradius with guided inputs, visible equations, substituted working, and model assumptions.

Triangle Height Calculator

Calculate triangle height with guided inputs, visible equations, substituted working, and model assumptions.

Triangle Inradius Calculator

Calculate triangle inradius with guided inputs, visible equations, substituted working, and model assumptions.

Two Mean Z Statistic Calculator

Calculate two mean z statistic with guided inputs, visible equations, substituted working, and model assumptions.

Two Proportion Confidence Interval Calculator

Calculate two proportion confidence interval with guided inputs, visible equations, substituted working, and model assumptions.

Two Proportion Z Statistic Calculator

Calculate two proportion z statistic with guided inputs, visible equations, substituted working, and model assumptions.

Continuous Uniform Probability Calculator

Calculate continuous uniform probability with guided inputs, visible equations, substituted working, and model assumptions.

Unsigned Stirling Cycle Calculator

Count permutations of labelled elements by their exact disjoint-cycle count.

Usability Test Note Template

Create a bounded, reviewable usability test note template from supplied research facts without collecting data, inferring findings, or claiming causality.

Usability Test Script

Create a bounded, browser-local usability test script with visible assumptions, review guidance, and downloadable output.

Variance From Sums Calculator

Calculate variance from sums with guided inputs, visible equations, substituted working, and model assumptions.