# Bland–Altman plot

**Bland-Altman plotagreementBland-Altman bias plotsBland–Altman diagramTukey mean difference plotTukey mean-difference plot**

A Bland–Altman plot (Difference plot) in analytical chemistry or biomedicine is a method of data plotting used in analyzing the agreement between two different assays.wikipedia

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### Plot (graphics)

**plotdata plotplots**

A Bland–Altman plot (Difference plot) in analytical chemistry or biomedicine is a method of data plotting used in analyzing the agreement between two different assays.

### MA plot

This version of the plot is used in MA plot.

An MA plot is an application of a Bland–Altman plot for visual representation of genomic data.

### Martin Bland

**J. Martin Bland**

It is identical to a Tukey mean-difference plot, the name by which it is known in other fields, but was popularised in medical statistics by J. Martin Bland and Douglas G. Altman.

Bland is known for his work on medical measurement, particularly methodology for method comparison studies such as the Bland-Altman plot.

### John Tukey

**John W. TukeyTukeyJohn Wilder Tukey**

It is identical to a Tukey mean-difference plot, the name by which it is known in other fields, but was popularised in medical statistics by J. Martin Bland and Douglas G. Altman.

### Analyse-it

See Analyse-it, MedCalc, NCSS, GraphPad Prism, R, or StatsDirect for software providing Bland–Altman plots.

Analyse-it Method Validation edition provides the standard Analyse-it statistical analyses above, plus procedures for method evaluation, validation and demonstration, including Bland-Altman bias plots, Linear regression, Weighted Linear regression, Deming regression, Weighted Deming regression and Passing Bablok for method comparison, Precision, Linearity, Detection limits, Reference intervals and Receiver operating characteristic analysis supporting Delong, Delong Clarke-Pearson comparisons.(see references below).

### MedCalc

See Analyse-it, MedCalc, NCSS, GraphPad Prism, R, or StatsDirect for software providing Bland–Altman plots.

Procedures for method evaluation and method comparison include ROC curve analysis, Bland–Altman plot, as well as Deming and Passing–Bablok regression.

### Analytical chemistry

**chemical analysisanalytical chemistanalytical**

A Bland–Altman plot (Difference plot) in analytical chemistry or biomedicine is a method of data plotting used in analyzing the agreement between two different assays.

### Assay

**assaysassayingbioassays**

A Bland–Altman plot (Difference plot) in analytical chemistry or biomedicine is a method of data plotting used in analyzing the agreement between two different assays.

### Medical statistics

**medical statisticianHealth Statisticspharmaceutical statistics**

It is identical to a Tukey mean-difference plot, the name by which it is known in other fields, but was popularised in medical statistics by J. Martin Bland and Douglas G. Altman.

### Doug Altman

**Douglas AltmanAltman, DougDouglas G. Altman**

### Correlation and dependence

**correlationcorrelatedcorrelations**

Bland and Altman make the point that any two methods that are designed to measure the same parameter (or property) should have good correlation when a set of samples are chosen such that the property to be determined varies considerably.

### Mean

**mean valueaveragepopulation mean**

Each of the n samples is then represented on the graph by assigning the mean of the two measurements as the x-value, and the difference between the two values as the y-value.

### Cartesian coordinate system

**Cartesian coordinatesCartesian coordinateCartesian**

The Cartesian coordinates of a given sample S with values of S_1 and S_2 determined by the two assays is

### Gold standard (test)

**gold standardgold standard testbenchmark**

It can also be used to compare a new measurement technique or method with a gold standard, as even a gold standard does not—and should not—imply it to be without error.

### NCSS (statistical software)

**NCSSNCSS Statistical Software**

See Analyse-it, MedCalc, NCSS, GraphPad Prism, R, or StatsDirect for software providing Bland–Altman plots.

### R (programming language)

**RR programming languageCRAN**

### StatsDirect

### Outlier

**outliersstatistical outliersconservative estimate**

Bland-Altman plots allow identification of any systematic difference between the measurements (i.e., fixed bias) or possible outliers.

### Standard deviation

**standard deviationssample standard deviationSD**

The mean difference is the estimated bias, and the SD of the differences measures the random fluctuations around this mean.

### Student's t-test

**t-testt''-testStudent's ''t''-test**

If the mean value of the difference differs significantly from 0 on the basis of a 1-sample t-test, this indicates the presence of fixed bias.

### Deming regression

**Demingline of best orthogonal fitOrthogonal distance regression**

This method was based on Deming regression—a method introduced by Adcock in 1878.

### List of statistics articles

**List of statistical topicsList of statistics topicsIndex of statistics articles**

### Tukey's range test

**Tukey–Kramer methodTukey methodTukey range test**

The Tukey HSD tests should not be confused with the Tukey Mean Difference tests (also known as the Bland–Altman diagram).

### Inter-rater reliability

**interrater reliabilityinter-rater agreementinter-observer reliability**

The resulting Bland–Altman plot demonstrates not only the overall degree of agreement, but also whether the agreement is related to the underlying value of the item.