How to do linear fitting of data to get R square value and coeficient of a,b ?

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Debarati Ghosh 2023-11-25

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https://ww2.mathworks.cn/matlabcentral/answers/2051927-how-to-do-linear-fitting-of-data-to-get-r-square-value-and-coeficient-of-a-b

评论： Debarati Ghosh 2024-3-27

I got x and y value. I want to fit the date linearly . I want to get Rsquare value and value of a and b. How to do in matlab?

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Answer 1

Ive J 2023-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/2051927-how-to-do-linear-fitting-of-data-to-get-r-square-value-and-coeficient-of-a-b#answer_1363164

在 MATLAB Online 中打开

n = 100;
x = randn(n, 1);
y = randn(n, 1);
mdl = fitlm(x, y)
mdl = 
Linear regression model:
    y ~ 1 + x1

Estimated Coefficients:
                   Estimate      SE        tStat     pValue 
                   ________    _______    _______    _______

    (Intercept)    0.014768    0.10405    0.14193    0.88742
    x1              0.11976    0.10612     1.1286    0.26182


Number of observations: 100, Error degrees of freedom: 98
Root Mean Squared Error: 1.03
R-squared: 0.0128,  Adjusted R-Squared: 0.00276
F-statistic vs. constant model: 1.27, p-value = 0.262