Cochran-Armitage Trend Test Analysis Tool
A professional statistical tool for detecting trends in proportions across ordered categorical variables. Used in clinical trials, epidemiology, and public health research.
Key Features
Interactive Contingency Tables
Create and edit contingency tables with unlimited rows and columns. Dynamic table that adjusts automatically as you add data.
Accurate Statistical Analysis
Real-time calculation of Cochran-Armitage test statistics, p-values, and significance levels using the exact formula.
Advanced Data Visualization
Generate clustered bar charts with percentage labels. Choose between row percentages, column percentages, or raw counts.
Professional Reports
Export complete analysis reports in Microsoft Word format with tables, results, interpretation, and visualizations.
Clear Interpretation
Automatic generation of statistical interpretation with significance highlighting and practical implications.
Statistical Methodology
Z = Σ yⱼ(xⱼ - x̄) / √[p̄(1-p̄) Σ nⱼ(xⱼ - x̄)²]
Where:
- xⱼ = scores for ordered groups (1, 2, 3, ...)
- yⱼ = success counts in each group
- nⱼ = total counts in each group
- x̄ = weighted mean of scores
- p̄ = overall proportion of successes
Citation & References
If you use CATrend Analyzer in your research, please cite it as:
Software Information: This software was developed using JavaScript, HTML5, and CSS3. The statistical calculations are based on the exact Cochran-Armitage formula. Last updated: February 2026.