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HAAAAH
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Finding Linear regression equation

Asked by HAAAAH
on 11 Sep 2019
Latest activity Answered by Bruno Luong
on 11 Sep 2019
I have table of data
x = [65 65 62 67 69 65 61 67]
y = [105 125 110 120 140 135 95 130]
How can i find the equation y = mx+b of linear regression. I have tried so far but dont know how to find m and b ?
x = [65 65 62 67 69 65 61 67]
y = [105 125 110 120 140 135 95 130]
plot (x,y, 'r*')
lsline
% determine how many samples do we have
N= length(x)
% Fit to f(x) = b + m*x
X = [ones [N,1] x]
b = mldivide(X,y)

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2 Answers

Answer by Torsten
on 11 Sep 2019
Edited by Torsten
on 11 Sep 2019

x = [65 65 62 67 69 65 61 67];
y = [105 125 110 120 140 135 95 130];
X = [ones(numel(x),1),x.'];
p = X\(y.');
b = p(1)
m = p(2)

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Answer by Bruno Luong
on 11 Sep 2019

P=polyfit(x,y,1);
m=P(1),
b=P(2),
% linefit = polyval(P,x)

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