Bland Altman Plot - Neatly Explained: Systematic Error [Bias], How to do Bland Altman plot

This video explains about Bland Altman Plot : Detailed explanation on Systematic Error [Bias], steps for constructing Bland Altman plot and How to do Bland Altman plot.
Bland Altman analysis is a commonly used analysis method in biomedical research.
This method is used to study the agreement between two measurements that are in continuous scale.
This method was introduced by J M Bland and D G Altman in the year 1983.
Bias is evaluated when:
Introducing new methods or instruments
To check consistency between parallel instruments
To check performance of new lot of reagents
To check changes in performance over time
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[@bic1349]

Thank you!

[@thesimplewonders1918]

Thanks so so much

[@fadhilfp6]

In case of checking changes in the performance over time do you mean with same method or technique... I do repeated measure before and after 2 different medications management can I use bland altman analysis to prove the changes are not subjected to bias or systematic errors and these changes occurred because the effect of 2 different management?
regards in advance

[@loris691]

Hey! What if your input-data contains only mean values ( plus the upper limitation and the lower tolerance). Is it then possible to use the Bland Altman for method comparison?

[@ahmedalbalushi8022]

thanks for the great explanation. but how to change the 95% agreement difference to percentage?

[@ytubeleo]

What do you mean? Those lines are the limits within which 95% of sample pairs should be. Do you mean you want the lines to instead mark +-X% of the difference? Just draw the lines at +-X%. If you have relative units on the Y-axis, they'll be horizontal lines, but if you want absolute units they're obviously going to have to be two lines diverging away from the mean in direct proportion to the the average.

[@alexc7910]

For the boundaries you are just using 1.96 X standard deviation of the difference, this equal to a 95% probability assuming a gaussian distribution. Check the gaussian probability function

[@weslylim7255]

hi friend, may I know if you had any reference articles for this video? It would help a a lot

[@giorgiapezzoni5176]

You can read some of the original papers Bland and Altman wrote (pubmed.ncbi.nlm.nih.gov/10501650/) or read a more recent review of it from 2015 here (www.biochemia-medica.com/en/journal/25/2/10.11613/BM.2015.015), these are the ones im citing in my dissertation

[@fadhilfp6]

The data out side the LOA how could you explained it