How to make intercept 0 in fitlm?

Question

Kash Costello 2018-6-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/405263-how-to-make-intercept-0-in-fitlm

评论： Kash Costello 2018-6-13

采纳的回答： Rik

在 MATLAB Online 中打开

Hello,

i have this code here. I got my result for this code but I want the intercept to be 0. Does anyone know how to do that?

A = [3 ; 6 ; 9 ; 12 ; 15 ; 18 ; 21 ; 24];

b = [13.65249633; 27.43151638; 40.81176096; 54.58291934; 69.15880849; 82.02503856; 95.68163465; 1.10E+02];

mdl = fitlm(A,b,'linear','RobustOpts','off')

Result: Estimate SE tStat pValue

______ ______ ______ ________

    (Intercept)    -0.14799     0.27475    -0.53862       0.60954
    x1                4.579    0.018137      252.47    2.6057e-13

is it possible to make the Estimated intercept 0? I am pretty sure that the estimated x1 will change in value and that's actually what I'm aiming for...

Thanks a lot!

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Answer 1

Rik 2018-6-12

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/405263-how-to-make-intercept-0-in-fitlm#answer_324422

在 MATLAB Online 中打开

If you just want the value for x1:

A = [3 ; 6 ; 9 ; 12 ; 15 ; 18 ; 21 ; 24];
b = [13.65249633; 27.43151638; 40.81176096; 54.58291934;...
    69.15880849; 82.02503856; 95.68163465; 1.10E+02];
x1=A\b;

If you want to force the intercept to 0, you can find the solution in the fitlm doc:

mdl = fitlm(A,b,'linear','Intercept',false)%'RobustOpts','off' is the default