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    %% Add Population and Fitted Mean Functions
% Generate data with a polynomial trend.

% Copyright 2015 The MathWorks, Inc.

p = [1 -2 -1 0];
t = 0:0.1:3;
rng default  % For reproducibility
y = polyval(p,t) + 0.5*randn(size(t));
%%
% Plot data and add the population mean function using |refcurve| .
plot(t,y,'ro')
h = refcurve(p);
h.Color = 'r';
%%
% Also add the fitted mean function.
q = polyfit(t,y,3);
refcurve(q)
legend('Data','Population Mean','Fitted Mean',...
		'Location','NW')