Create confidence interval for linear regression line
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Andrea Bedin
on 26 Jun 2019
Answered: Star Strider
on 26 Jun 2019
Hi, how can I plot a confidence interval bound for the regresison line using lsline? The code I wrote is this:
clc, clear all, close all
X(:,1) = (1:1:100);
X(:,2) = rand(100,1);
figure;
hold on
plot(X(:,1),X(:,2),'b*','MarkerSize',5);
h = lsline;
set(h,'color','g','LineWidth',3)
%s = lsline + 0.95 * h;
title 'TRY';
xlabel 'X';
ylabel 'Y';
hold off
Thank you
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Accepted Answer
Star Strider
on 26 Jun 2019
I would use the fitlm (link) function to calculate the regression line, the the predict function to calculate the confidence intervals. If you want to use polyfit and polyval instead, you can use the File Exchange contribution polypredci.
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