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Bland–Altman agreement plot

Both measurements in a pair must be of the same quantity in the same units. Differences are x − y.

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Both measurements in a pair must be of the same quantity in the same units. Differences are x − y. The normal limits describe bias ± z·SD, not whether individual readings are interchangeable. Confidence intervals for the limits use an explicit approximate model of independent, normally distributed differences. Check the plot for bias that depends on magnitude. Use 2 to 5000 pairs.

Model, grammar and limits

d=x−y; m=(x+y)/2; LoA=d̄±z·sᵈ

Limits: 256000 raw data characters, 5000 source records and 50000 cells in total; decimals up to 48 characters; up to 20 groups or contributions and 50 columns. Limits for exact and bootstrap methods are stated with each tool. Parsing and resource checks run before the calculation, and the worker stops after 15 seconds. Editing, canceling or resetting discards pending results.

Check assumptions, ties and missing values before drawing conclusions. Results show 10 significant digits; CSV keeps the numeric values and units. Exact enumeration means exact counts, not exact displayed decimals. Numerical tail zeros, floors and unavailable intervals are labeled. Nothing here is a diagnosis, proof of causation or validity approval.

Your data stays in this browser. The calculation runs in a local worker, and CSV and backup files are local downloads you choose to make. Your data is not sent anywhere or saved silently, so keep your original data. Input data, formulas and filenames are never sent. Only with your optional consent, Refentra sends aggregate counts of actions and outcomes, without input content.

Use a decimal point. Commas/tabs separate matrix columns; newlines separate rows. NA or empty matrix cells are missing. No automatic deletion of extremes.
Paired columns x, y — Edit data cell

Use the chosen model

  1. Model, grammar and limits

    Both measurements in a pair must be of the same quantity in the same units. Differences are x − y. The normal limits describe bias ± z·SD, not whether individual readings are interchangeable. Confidence intervals for the limits use an explicit approximate model of independent, normally distributed differences. Check the plot for bias that depends on magnitude. Use 2 to 5000 pairs.

  2. Calculate

    d=x−y; m=(x+y)/2; LoA=d̄±z·sᵈ. Limits: 256000 raw data characters, 5000 source records and 50000 cells in total; decimals up to 48 characters; up to 20 groups or contributions and 50 columns. Limits for exact and bootstrap methods are stated with each tool. Parsing and resource checks run before the calculation, and the worker stops after 15 seconds. Editing, canceling or resetting discards pending results.

  3. Download CSV report

    Check assumptions, ties and missing values before drawing conclusions. Results show 10 significant digits; CSV keeps the numeric values and units. Exact enumeration means exact counts, not exact displayed decimals. Numerical tail zeros, floors and unavailable intervals are labeled. Nothing here is a diagnosis, proof of causation or validity approval. Your data stays in this browser. The calculation runs in a local worker, and CSV and backup files are local downloads you choose to make. Your data is not sent anywhere or saved silently, so keep your original data. Input data, formulas and filenames are never sent. Only with your optional consent, Refentra sends aggregate counts of actions and outcomes, without input content.

Model questions

Model, grammar and limits

Both measurements in a pair must be of the same quantity in the same units. Differences are x − y. The normal limits describe bias ± z·SD, not whether individual readings are interchangeable. Confidence intervals for the limits use an explicit approximate model of independent, normally distributed differences. Check the plot for bias that depends on magnitude. Use 2 to 5000 pairs. d=x−y; m=(x+y)/2; LoA=d̄±z·sᵈ

Unit

Paired columns x, y; Descriptive normal limit coverage (1); Confidence level, fraction (1); Missing-data policy; Measurement / score unit. Limits: 256000 raw data characters, 5000 source records and 50000 cells in total; decimals up to 48 characters; up to 20 groups or contributions and 50 columns. Limits for exact and bootstrap methods are stated with each tool. Parsing and resource checks run before the calculation, and the worker stops after 15 seconds. Editing, canceling or resetting discards pending results.

Model results

Check assumptions, ties and missing values before drawing conclusions. Results show 10 significant digits; CSV keeps the numeric values and units. Exact enumeration means exact counts, not exact displayed decimals. Numerical tail zeros, floors and unavailable intervals are labeled. Nothing here is a diagnosis, proof of causation or validity approval.

Download input backup

Your data stays in this browser. The calculation runs in a local worker, and CSV and backup files are local downloads you choose to make. Your data is not sent anywhere or saved silently, so keep your original data. Input data, formulas and filenames are never sent. Only with your optional consent, Refentra sends aggregate counts of actions and outcomes, without input content.