Error bar on probability distribution function

The standard deviation represents the data spread around the mean and used to plot the error bar on the probability distribution plot by using the “errorbar” function. The standard deviation is used as the parameter for the errorbar height.

The code below shows the plotting of the error bars on the pdf plot:

data = diameter_TAC'; 
% Calculate the standard deviation of the data
std_dev = std(data);
% Plot the PDF
figure;
plot(x, y, 'k-', 'LineWidth', 2);
hold on;
% Add error bars
% plot them at each point of x. 
errorbar(x, y, repmat(std_dev, size(x)), 'k.', 'LineWidth', 1);

Kindly refer to the below documentations of “repmat” and “errorbar” for more details:

“repmat”: https://www.mathworks.com/help/matlab/ref/repmat.html

“errorbar” : https://www.mathworks.com/help/matlab/ref/errorbar.html

4 个评论
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Neda 2024-9-20，6:15

Thank you so much.

What is this scale? can I simply divide all stds by 1000 to have a smaller bar on the graph?

Vinay 2024-9-20，6:29

The scale is to align the stds to the pdf value by scaling the stds value relative to the maximum value of the PDF. You can use the custom scaling factor to adjust the height.

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