Hello everyone
i have some x,y data. i have used the "Curve Fitting" app in matlab to carry out a simple linear regression analysis. it worked wonderfully.
i have quite a few data sets i would like to fit so i asked Matlab to generate Matlab code. But the matlab code that was generated only give the plot of the regression and the plot of the residuals. The model (ax+b) aswell as R^2 and adjusted R^2 is not shown anywhere. the code is shown below
%%Regression analysis
[xData, yData] = prepareCurveData(A(1,start:end),M(1,start:end));% Set up fittype and options.
ft = fittype( 'poly1' ); % Linear polynomial curve, = ax+b
opts = fitoptions( ft );opts.Lower = [-Inf -Inf];opts.Upper = [Inf Inf];% Fit model to data.
[fitresult, gof] = fit( xData, yData, ft, opts );% Create a figure for the plots.
figure( 'Name', 'Linear Regression' );title('Linear Regression')% Plot fit with data.
subplot( 2, 1, 1 );h = plot( fitresult, xData, yData );legend( h, 'Data', 'Linear Regression', 'Location', 'NorthEast' );% Label axes
xlabel( 'x' );ylabel( 'y' );grid on% Plot residuals.
subplot( 2, 1, 2 );h = plot( fitresult, xData, yData, 'residuals' );legend( h, 'Linear Regression - residuals', 'Zero Line', 'Location', 'NorthEast' );% Label axesxlabel( 'x' );ylabel( 'Residuals' );grid on
Both the model and the goodness of fit is saved as variables, "fitresult" and "gof" respectivly. but i do not know how to display them together/inside the figure. i can of course make the figure and then afterwards use e.g. disp(gof) to retrieve the goodness of fit. but then i have to put them together in another program before i can actually use the figure
i have the statistics toolbox installed in case that is relevant
Best Answer