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THE FEUTEX TOOLKIT

Bland–Altman Agreement Limits

Calculate mean bias and normal-theory limits of agreement from paired-difference summaries.

Statistics workspace● Runs in your browser
01 Your input
02 Your result
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FormulaLower = bias-z*sd; Upper = bias+z*sd; Width = 2*z*sd
Sources and model references

Made for real tasks

  • Calculate mean bias and normal-theory limits of agreement from paired-difference summaries.
Explore step-by-step workflows →

Worked example

Inputs

Mean paired difference
0.5 number
Difference standard deviation
2 number
Normal multiplier
1.96 number

Expected results

Lower
-3.42 number
Upper
4.42 number
Width
7.84 number

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter mean paired difference, difference standard deviation, normal multiplier.
  2. Use the displayed units and confirm the model assumptions.
  3. Calculate and compare the outputs against your input scenario.

Try this example

{
  "bias": 0.5,
  "sd": 2,
  "z": 1.96
}

Accuracy and scope

These are agreement limits, not confidence limits for the mean. Assumes stable, approximately normal differences and independent pairs.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.