inspection of linearity of data?

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Khan Muhammad Adeel Khan2022-10-24
Hello ! I want to check the linearity between two data set named as L_comp and L? please find attached. How can I check the trend of the following dataset? Many thanks !

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Chunru 2022-10-25
load(websave("check_linearity.mat","https://www.mathworks.com/matlabcentral/answers/uploaded_files/1167363/check_linearity.mat"))
whos
Name Size Bytes Class Attributes L 122x1 976 double L_comp 122x1 976 double cmdout 1x33 66 char
% use curve fitting toolbox
f = fit(L, L_comp, 'poly1')
f =
Linear model Poly1: f(x) = p1*x + p2 Coefficients (with 95% confidence bounds): p1 = -0.2864 (-0.3991, -0.1736) p2 = 0.2222 (0.199, 0.2455)
plot(f, L, L_comp)
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Many thanks! Could you please explain the output a bit ? How we can save the slope, and then test all the slopes within each group against 0 via the ttest function?
Linear model Poly1:
f(x) = p1*x + p2
Coefficients (with 95% confidence bounds):
p1 = -0.2864 (-0.3991, -0.1736)
p2 = 0.2222 (0.199, 0.2455)

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