Statoma

Statistics topics

Statoma topics will become the guide layer between statistical concepts and calculator workflows. The first topic pages are not published yet, but this index shows how the library will be organized.

Hypothesis tests

Guides in this group will explain null hypotheses, alternatives, test statistics, tail direction, degrees of freedom, and the difference between statistical evidence and practical importance.

Estimation and uncertainty

This group will focus on standard errors, margins of error, confidence levels, interval interpretation, and the difference between an estimate and a decision rule.

Study planning

Planning guides will connect statistical power, detectable effects, precision targets, attrition, design effects, and the assumptions that should be settled before data collection starts.

How Topics Will Work

Calculator pages answer a focused question: enter the right summary values, get the statistic, and read the interpretation. Topic pages will answer the broader questions that often come before the calculator: what kind of question is this, what assumptions matter, what can the result say, and what should be reported with it.

The planned topics will link back to calculators with descriptive anchors rather than generic prompts. A guide to p-values should point to the p-value calculator when a user already has a test statistic. A guide to power should point to the sample size calculator when the user is planning a study. A guide to categorical data should point to the chi-square calculator when the question is about observed and expected counts.

Planned Topic Areas

  • Understanding p-values without treating them as the probability that the null hypothesis is true.
  • Choosing between one-sample, paired, independent, and Welch t-tests based on study design.
  • Reading confidence intervals as estimation tools rather than yes-or-no significance tests.
  • Planning sample size around precision, power, attrition, and realistic effect sizes.
  • Checking categorical data with expected counts, contingency tables, and chi-square assumptions.

Until those guides are published, the Statoma calculator index is the main route into the site.