Hypothesis Testing
statisticst-tests, Wilcoxon-Mann-Whitney and one-way ANOVA for comparing datasets.
Data
One observation per line. Columns can be separated by spaces, commas, semicolons or tabs, so you can paste straight from Excel.
| Column | What it is | Example |
|---|---|---|
| 1. Group | Which population the result belongs to | Background |
| 2. Result | The measured value | 12.4 |
A line looks like Background 12.4
A single column with no group name is treated as one group. For a result below the laboratory limit of reporting, enter it as <LOR, e.g. <0.5.
Drop a CSV or Excel file here, or
Read in your browser and put in the box below. The file itself is not uploaded.
2 group(s) parsed
Options
Paste your data and run the analysis
Test results and a group comparison plot will appear here.
What this calculates
Comparison tests for one, two or more datasets: the one- and two-sample t-tests (Student's pooled variance or Welch's unequal-variance form), the Wilcoxon-Mann-Whitney rank-sum test for non-normal data, and one-way ANOVA with Bonferroni-adjusted post-hoc pairwise comparisons when three or more groups differ.
Method references
Gilbert (1987) Statistical Methods for Environmental Pollution Monitoring and US EPA statistical guidance for environmental data.