About this example
An identity reference marks where two readings with comparable units would be equal. The negative observation is retained, so this example also checks that the plot does not assume positive-only measurements.
Distance from the identity line is a visual comparison, not an agreement analysis. The tool calculates neither limits of agreement nor evidence that the instruments are interchangeable.
The data
| X | Y |
|---|---|
| -2 | -1.7 |
| 0 | 0.2 |
| 1 | 0.8 |
| 3 | 3.4 |
| 5 | 4.7 |
Each row is a supplied numeric pair; reference lines are not fitted models. Open the example, replace the data with your own, and export the figure as SVG, PDF, PNG or TIFF.