how do I add MEAN to Boxplot?

Question

Mohammed 2016-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/307208-how-do-i-add-mean-to-boxplot

编辑： JB676 2024-4-2，14:38

I am thinking about locating MEAN as a straight horizontal line or a symbol inside the boxplots for illustration purposes. I would say it is possible since distributions are not significantly skewed. Any suggestions?!

Here is a MATLAB sample code:

rng default  % For reproducibility
x1 = normrnd(5,1,100,1);
x2 = normrnd(6,1,100,1);
figure
boxplot([x1,x2],'Notch','on','Labels',{'mu = 5','mu = 6'})
title('Compare Random Data from Different Distributions')
cust_colr = [0, 0.5, 1
    0.60156, 0.80078, 0.19531
    0.5, 0, 0];
h = findobj(gca,'Tag','Box');
 for j=1:length(h)
     patch(get(h(j),'XData'),get(h(j),'YData'),cust_colr(j,:));
 end

Output picture is shown below:

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Answer 1

michio 2016-10-14

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在 MATLAB Online 中打开

The ability to plot the mean values using boxplot is not available as of release R2016b. To work around this issue, you can find these values and plot them manually. The example below shows how to plot the mean value of each group:

 % Generate random data
 X = rand(10);
 % Create a new figure and draw a box plot
 figure;
 boxplot(X)
 % Overlay the mean as green diamonds
 hold on
 plot(mean(X), 'dg')
 hold off

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JIAYING WU 2020-8-29

but the means do includes outliers if there are any?

Bárbara Antonucci 2021-9-7

Is functionally. Very great!

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Answer 2

Camilo Cárdenas 2022-4-13

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Hi, thank you for your post.

I have got a question:

What aboout, if you have more than one box in a Diagramm? How can you assingn it to each group of data?

Thanks!

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Simon Diaz 2022-9-28

在 MATLAB Online 中打开

Hi, try to

% Generate random data
 X = rand(10,4);
 % Create names of each group
 names = {'name1','name2','name3','name4'};
 
 % Create a new figure and draw a box plot
 figure;
 boxplot(X,'Labels',names)
 % Overlay the mean as green diamonds
 hold on
 plot(1:length(X(1,:)),mean(X), 'dg')  % x-axis is the intergers of position
 hold off

JB676 2024-4-2，14:36

编辑：JB676 2024-4-2，14:38

在 MATLAB Online 中打开

mu_T = % set of values for category 1
mu_RN = % set of values for category 2
mu_T_RN, grp_T_RN = % combined dataset values and labels
hb = boxplot(mu_T_RN,grp_T_RN,'whisker',1);
% replace median with mean value
set(hb(6,1),'ydata',[mean(mu_T) mean(mu_T)]);
set(hb(6,2),'ydata',[mean(mu_RN) mean(mu_RN)]);