REGRESSION ANALYSIS

Orthogonal Regression

Compare two measurement methods when both X and Y contain measurement error. This tool supports instrument correlation, method comparison, and calibration studies with engineering interpretation and a standardized Study Report.

PDF Study Report Included

Required Data Structure

Use paired numeric measurements from two methods or instruments.

X method or reference measurement
Y method or comparison measurement
Rows with missing or nonnumeric selected values are ignored

Download Example CSV

Reference Method	New Method
10.0	10.2
12.0	11.9
14.0	14.3

Input Data

Upload CSVPaste CSV Data

X Variable / Reference Method

Y Variable / Comparison Method

Variance Ratio λ (X error variance / Y error variance)

Orthogonal Regression Results

Agreement Summary

Model Evidence

Diagnostic Plots

Study Report

Generate an Orthogonal Regression Study Report with method comparison evidence, diagnostics, engineering interpretation, criteria reference, and method notes.