# Adding standard error bars to grouped bar graph

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Heather on 22 Mar 2019
Commented: elena kerjean on 21 Apr 2020
I was able to produce the bar graph below using the following code. After reading the doc and some other threads, I still can't seem to add standard error bars. Any advice would be appreciated!
y=[0.095 0.037 0.132; 0.1 0.058 0.158; 0 0 0.02; 0 0 0]
bar(y)
set(gca, 'XTickLabel', {'Rural' 'Exurban' 'Suburban' 'Urban'});
hold on

Star Strider on 22 Mar 2019
You are in luck in not using categorical variables, because this approach will not work with them (although I’ve not had the opportunity to read through the complete R2019a Release Notes yet, so there may be options I’m not aware of).
Try this:
y=[0.095 0.037 0.132; 0.1 0.058 0.158; 0 0 0.02; 0 0 0]
StdErr = rand(3,4)*0.01; % Create ‘Standard Error’ Matrix
figure
hBar = bar(y, 0.8); % Return ‘bar’ Handle
for k1 = 1:size(y,2)
ctr(k1,:) = bsxfun(@plus, hBar(k1).XData, hBar(k1).XOffset'); % Note: ‘XOffset’ Is An Undocumented Feature, This Selects The ‘bar’ Centres
ydt(k1,:) = hBar(k1).YData; % Individual Bar Heights
end
hold on
errorbar(ctr, ydt, StdErr, '.r') % Plot Error Bars
set(gca, 'XTickLabel', {'Rural' 'Exurban' 'Suburban' 'Urban'});
You did not supply your ‘Standard Error’ matrix, so I created one. Note that it must be the same size as the one I created, in order for this code to work.
elena kerjean on 21 Apr 2020
How could we adapte you respons for different size of y (mine is (3,5) and I have trouble to adapte) ?

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