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Bland Altman plot

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Bland Altman plot

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26 Sep 2008 (Updated )

Generates bland Altman plot

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Description

Function to generate Bland Altman plots. Barry Greene, September 2008
Bland, J.M., Altman, D.G. 'Statistical methods for assessing agreement ...
between two methods of clinical measurement'(1986) Lancet, 1 (8476), pp. 307-310.
Inputs: data1: Data from first instrument
        data2: Data from second instument
Outputs: data_mean: Mean of data recorded by both instruments
data_diff: Difference of data recorded by both instruments
md: Mean difference
sd: Standard deviation of difference
Produces Bland Altman plot with mean difference and mean difference +/-
2*SD difference lines.

MATLAB release MATLAB 7.6 (R2008a)
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Comments and Ratings (3)
13 Mar 2014 Pete

I think your calculation of the CR is off (standard deviation is usually corrected by N-1 when using the sample-population. Cf. http://www.medcalc.org/manual/blandaltman.php)

21 May 2010 Dan

Standard deviation lines are incorrect if the mean of the data is negative.

02 Oct 2008 Anonemous Anonemous

You didn't provide mean_nan.m and std_nan.m needed by bland_altman.m. Can you please also post them? Thanks.

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