How to get the error value when fitting a gaussin curve to a data?

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Joao Costa 2015-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/168984-how-to-get-the-error-value-when-fitting-a-gaussin-curve-to-a-data

评论： Star Strider 2015-1-7

I have the following data fitting curve:

And i'd like to compute the error associated to this fitting, the var error! If some one knows how to do it please help me.

Thanks

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Answer 1

Star Strider 2015-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/168984-how-to-get-the-error-value-when-fitting-a-gaussin-curve-to-a-data#answer_164055

在 MATLAB Online 中打开

To do the plot and get the data to analyse the error of the fit, this works:

x = 0.25*randn(1000,1)+1;                       % Create Data
h = histfit(x,50);
histdata = get(h(1),'XData');                   % Get Histogram Data
redcurve = get(h(2),'YData');                   % Get Fit Data
histctrs = mean(histdata);                      % Mean Of Bin Edges
redcurve2 = mean(reshape(redcurve, 2, []));     % Mean Of Bin Edges Fit
fit_err = histctrs - redcurve2;                 % Error
SSE = sum(fit_err.^2);                          % Sum-Squared Error
MSE = mean(fit_err.^2);                         % Mean-Squared-Error
RMSE = sqrt(MSE);                               % Root-Mean-Squared-Error