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    %% Add a Reference Line at the Mean
% Generate sample data for independent variable |x| and a dependent variable
% |y| . 

% Copyright 2015 The MathWorks, Inc.

x = 1:10;
y = x + randn(1,10);
%%
% Create a scatter plot of |x| and |y| .
scatter(x,y,25,'b','*')
%%
% Superimpose a least-squares line on the scatter plot.
lsline
%%
% Add a reference line at the mean of the scatter and its least-squares
% line.
mu = mean(y);
hline = refline([0 mu]);
hline.Color = 'r';
%%
% The red line shows the reference line at the mean of data.