How to display sample size on each box of a boxplot? Many boxes have different sample sizes.

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George McFadden 2012-10-1

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https://ww2.mathworks.cn/matlabcentral/answers/49570-how-to-display-sample-size-on-each-box-of-a-boxplot-many-boxes-have-different-sample-sizes

Say I graph a boxplot figure with 4 boxes. I would like to display the sample size, n, for each of the individual boxes on the figure. How do I do this?

Thanks!

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Answer 1

Star Strider 2012-10-1

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编辑：Star Strider 2012-10-5

在 MATLAB Online 中打开

I suggest text. You'll likely have to experiment with it a bit to get the effect you want.

An example:

D = normrnd(0, 1, 10, 4) + repmat([0 1 2 3]*0.5,10,1);
M = mean(D);
G = {'A' 'B' 'C' 'D'};
N = [12  5  8  10];
figure(1)
boxplot(D,G)
for k1 = 1:size(D,2)
    text(k1-0.15,M(k1)*1.2, sprintf('N = %d', N(k1)), 'FontSize',8);
end

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George McFadden 2012-10-23

Thanks Star Strider. Text solves many questions like this one. I am surprised that boxplot does not have a built-in option for this. Its a common feature of boxplots in publications.