How can i draw Confidence interval graph for my data?...(i'm beginner)

Question

Bluemin 2021-3-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/784066-how-can-i-draw-confidence-interval-graph-for-my-data-i-m-beginner

回答： Bjorn Gustavsson 2021-3-26

data.mat

I used this code ...

x = 1:100;                                          % Create Independent Variable
y = randn(50,100);                                  % Create Dependent Variable ‘Experiments’ Data
N = size(y,1);                                      % Number of ‘Experiments’ In Data Set
yMean = mean(y);                                    % Mean Of All Experiments At Each Value Of ‘x’
ySEM = std(y)/sqrt(N);                              % Compute ‘Standard Error Of The Mean’ Of All Experiments At Each Value Of ‘x’
CI95 = tinv([0.025 0.975], N-1);                    % Calculate 95% Probability Intervals Of t-Distribution
yCI95 = bsxfun(@times, ySEM, CI95(:));              % Calculate 95% Confidence Intervals Of All Experiments At Each Value Of ‘x’
figure
plot(x, yMean)                                      % Plot Mean Of All Experiments
hold on
plot(x, yCI95+yMean)                                % Plot 95% Confidence Intervals Of All Experiments
hold off
grid

and then I want to draw graph.. like this..

so, Someone gave me the code

Replace the second plot call with

patch([x, fliplr(x)], [yCI95(1,:) fliplr(yCI95(2,:))], 'b', 'EdgeColor','none', 'FaceAlpha',0.25)

like this picture...

q1 ) Is this a certain confidence interval graph correct? I think that It is very different from the original data picture

this is original graph

q2 ) and then How do I draw a confidence interval graph using my data? my data is uploaded

plz help me..

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Answer 1

Bjorn Gustavsson 2021-3-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/784066-how-can-i-draw-confidence-interval-graph-for-my-data-i-m-beginner#answer_658846

The second graph is certainly not correct - since it is centred around zero and not around the average at each point, you have to add that t your confidence intervalls. For neat plots like this there are a number contributions on the file exchange: confplot, errorfill, boundedline, shaded-error-bar-yy, fillplot-mat, errorshade, shadederrorbar, shplot and more.

HTH