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

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Bluemin
Bluemin 2021-3-26
回答： Bjorn Gustavsson 2021-3-26
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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回答（1 个）

Bjorn Gustavsson
Bjorn Gustavsson 2021-3-26
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

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