How to obtain R square value

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Andoni Mendialdua 2014-9-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/153055-how-to-obtain-r-square-value

评论： Star Strider 2014-9-1

采纳的回答： Star Strider

Hi all,

coefficientsold = polyfit(AAT,QErot1,1)

Ygg=polyval(coefficientsold,AAT)

figure

axis([-10 80 0 15])

plot(AAT,QErot1,'s',AAT,Ygg,'--','MarkerFaceColor',[0 0 0])

By using this code what I obtain is a linear equation that fits my data, but I am not able to obtain the R-square value.

I would be glad if you could tell be how to obtain the r-square value, if it is possible by the use of the regress function, because I am not able to understand the use of this function properly.

Thank you very much

Andoni

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Star Strider 2014-9-1

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/153055-how-to-obtain-r-square-value#answer_150358

Use the core MATLAB corrcoef function. It will give you the R values and the significance levels (probabilities) and confidence intervals if you want them.

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Andoni Mendialdua 2014-9-1

Thank you, and what about the R matrix? what does 0.938 value mean?

Andoni

Star Strider 2014-9-1

My pleasure!

The 0.938 value is the correlation coefficient for your data. I refer you to the documentation (hyperlink in my original Answer) for a full explanation. (The 1 values on the diagonal of the R matrix are because each variable is perfectly correlated with itself. This is correct, even though the corresponding P values equal to 1 on the diagonal of the P matrix are not correct.)

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