fig5_3

 Local Regression and Likelihood, Figure 5.3.
 Author: Catherine Loader

 Density Estimation using poisson regression.
 Stamp thickness data.

0001 % Local Regression and Likelihood, Figure 5.3.
0002 % Author: Catherine Loader
0003 %
0004 % Density Estimation using poisson regression.
0005 % Stamp thickness data.
0006 
0007 load stamp;
0008 n = sum(count);
0009 w = 0.001*n*ones(76,1);
0010 fit = locfit(thick,count,'weights',w,'family','poisson','alpha',[0 0.004]);
0011 figure('Name','fig5_3: Poisson regression density estimation' );
0012 lfplot(fit);
0013 xlabel('Thickness (m.m.)');
0014 ylabel('Density');