Bland-Altman Plot [Simply explained]

What is a Bland-Altman Plot? The Bland-Altman plot is a graphical method to compare two measurements. In essence, a Bland-Altman plot is a scatter plot where the differences between two measurements are plotted against their averages. This helps to visualize the degree of agreement between the two raters and identify any systematic bias.
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0:00 What is a Bland-Altman Plot?
0:28 Example of a Bland-Altman Plot
0:48 How to create a Bland-Altman Plot?
3:22 How to interpret a Bland-Altman Plot?

[@datatab]

If you like, please find our e-Book here: datatab.net/statistics-book 😎

[@JavierBonillaC]

Very nice! Particuarly the idea about the heteroscedasticity

[@datatab]

Thanks : ) Regards, Hannah

[@mirzamursalin1748]

Excellent job

[@samuelhamilton5245]

Thank you. This was very useful

[@datatab]

Glad it was helpful!

[@justinangeles4192]

Thank you for the great videos. When would we use Cohens Kappa vs Bland-Altman plot when we want to assess for agreement?

[@datatab]

Both Cohen's Kappa and the Bland-Altman plot are methods for assessing agreement, but they're used in different contexts and have different implications!
Cohen's Kappa use primarily for categorical data.
Bland-Altman Plot Use primarily for continuous or ordinal data.
If you're assessing agreement between two raters or methods that are classifying subjects/items into categories (like "yes" or "no"), Cohen's Kappa would be appropriate.
If you're comparing two methods of measurement for a continuous outcome to see if they give similar results across a range of values, a Bland-Altman plot would be more appropriate.
I hoe this was helpful! Regards Hannah

[@abdelgaderalfallah]

Splendid 🎉
Keep sharing

[@datatab]

Thank you, I will : )

[@albertchinhenzva8592]

Many thanks. If the difference is negative do we plot it like that or take the modulus?

[@datatab]

Hi, maybe there are other confessions, but I would show the negative one! Regards Hannah

[@kaesarka3243]

Thanks a lot

[@datatab]

Most welcome

[@subodhshetty5963]

nice

[@datatab]

Thanks

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[@samuelhamilton5245]

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[@riccimer]

That is not true! She comes from the land of Arnie the Styrian oak. But her english is perfectly correct.

[@MrGeriausias]

@@riccimer There are two opinions. Should I make a Bland-Altman plot?

[@nmadikizela7845]

@@MrGeriausias You might have to use Cohen's kappa to assess the inter-rater variability for this categorical variable.