fig6_5

 Local Regression and Likelihood, Figure 6.5.
 Author: Catherine Loader

 Local smooth of CO2 dataset.
 Use bivariate fit to capture the two trends.

 bonus plot: fitted values vs year.

0001 % Local Regression and Likelihood, Figure 6.5.
0002 % Author: Catherine Loader
0003 %
0004 % Local smooth of CO2 dataset.
0005 % Use bivariate fit to capture the two trends.
0006 %
0007 % bonus plot: fitted values vs year.
0008 
0009 load co2;
0010 fit = locfit([month year+month/12],co2,'alpha',0.2,'style','an','scale',[6/pi,10]);
0011 
0012 figure('Name','fig6_5a: Local smoothing');
0013 lfplot(fit,'contour');
0014 xlabel('Month');
0015 ylabel('Year');
0016 
0017 figure('Name','fig6_5b: Local smoothing');
0018 plot(year+month/12,fitted(fit));
0019 xlabel('Year');
0020 ylabel('CO_2');
0021