MATLAB: Showing correlation on scatter

scatter

I want to show the R-squared value on the scatterplot. I am using corrcoef function to get the correlation value. I wonder how I can show the correlation or R-squared value on the scatterplot? I appereciate your help.

R=corrcoef(X,Y) R_squared=R(2)^2 scatter(X,Y)

Best Answer

Use the text function:

text(x_text, y_text, ['R^2 = ' num2str(R_squared)])

where x_text and y_text are coordinates of where you want to place the text.

HTH,

Arnaud

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MATLAB: How to obtain the R-squared and adjusted R-squared values from STEPWISEFIT in the Statistics Toolbox R2011a (Statistics Toolbox version 7.5)

The R-squared and adjusted R-squared statistics are not available in the ‘stats’ output of the programmatic STEPWISEFIT function. As a workaround, you can derive the values of the R-squared and adjusted R-squared statistics from other values that are in the output, by using the following commands

[b,se,pval,inmodel,stats,nextstep,history] = stepwisefit(XX,y);
% To obtain R-squared values
n = length(y);
rsq = 1 - (history.rmse.^2/var(y)) .* ((n-1-history.df0)/(n-1))
% To obtain Adjusted R-Squared values. 
adjrsq = 1 - history.rmse.^2/var(y)

Note that the RMSE field in "history" corresponds to the root mean square errors for the model at each step. Hence, "rsq" and "adjrsq" will be vectors, where the elements correspond to the R-squared values at different steps.

MATLAB: Different R squared from fitlm and corrcoeff

Diana, you're comparing two different things, though they are related. See, e.g. this wikipedia entry.

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Related Solutions

MATLAB: How to obtain the R-squared and adjusted R-squared values from STEPWISEFIT in the Statistics Toolbox R2011a (Statistics Toolbox version 7.5)

MATLAB: Different R squared from fitlm and corrcoeff

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