www.gusucode.com > stats 源码程序 matlab案例代码 > stats/BoxPlotConceptExample.m
%% Compare Grouped Data Using Box Plots %% % Load the Fisher iris sample data. The data contains length and width % measurements from the sepals and petals of three species of iris flowers. % Store the petal length data for the versicolor irises as |s1|, and the % petal length data for the virginica irises as |s2|. load fisheriris s1 = meas(51:100,3); s2 = meas(101:150,3); %% % Create a box plot using the sample data. Include a notch on the plot and % label each box with the name of the iris species it represents. figure boxplot([s1 s2],'notch','on',... 'labels',{'versicolor','virginica'}) %% % The notches of the two box plots do not overlap, which indicates % that the median petal length of the versicolor and virginica irises are % significantly different at the 5% significance level. %% % The median line in the versicolor plot does not appear to be centered % inside the box, which indicates that the sample is slightly skewed. % Additionally, the versicolor data contains one outlier value, while the % virginica data does not contain any outliers.