Hey Gianluca,
A bar graph can be created with error bars and significance stars in MATLAB using basic plotting functions like “bar”, “errorbar”, and “text” for the stars.
Here is how it could be achieved:
- Compute Means and Standard Deviations.
means = [mean(data1), mean(data2)];
stds = [std(data1), std(data2)];
2. Plot bars for mean values. Adds error bars for standard deviations.
figure;
b = bar(means, 'FaceColor', [0.2 0.6 0.5]);
hold on;
errorbar(1:2, means, stds, '.k', 'LineWidth', 1.5);
3. Perform t-test to get p-values.
[h, p] = ttest2(data1, data2);
4. Add Significance Stars (*, **, ***, or 'n.s.') using “text” and “plot” based on p-values.
if p < 0.001
stars = '***';
elseif p < 0.01
stars = '**';
elseif p < 0.05
stars = '*';
else
stars = 'n.s.';
end
% Add stars above the bars
maxY = max(means + stds) + 0.2;
text(1.5, maxY, stars, 'HorizontalAlignment', 'center', 'FontSize', 14);
For more information on the MATLAB functions used above, please refer to the following documentation links:
