how do I add MEAN to Boxplot?

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Mohammed
Mohammed 2016-10-13
编辑： JB676 2024-4-2
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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采纳的回答

michio
michio 2016-10-14
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
JIAYING WU 2020-8-29
but the means do includes outliers if there are any?

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Camilo Cárdenas
Camilo Cárdenas 2022-4-13
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!
  2 个评论
Simon Diaz
Simon Diaz 2022-9-28
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
JB676 2024-4-2
编辑：JB676 2024-4-2
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)]);
Get the handle to the boxplot, then adjust item 6 'ydata'. For a two category example:

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