% Data from StatLib (ftp stat.cmu.edu/datasets)
% 
% This is the pollution data so loved by writers of papers on ridge regression.
% Source: McDonald, G.C. and Schwing, R.C. (1973) 'Instabilities of regression
% estimates relating air pollution to mortality', Technometrics, vol.15, 463-
% 482.
% Variables in order:
% PREC   Average annual precipitation in inches
% JANT   Average January temperature in degrees F
% JULT   Same for July
% OVR65  % of 1960 SMSA population aged 65 or older
% POPN   Average household size
% EDUC   Median school years completed by those over 22
% HOUS   % of housing units which are sound & with all facilities
% DENS   Population per sq. mile in urbanized areas, 1960
% NONW   % non-white population in urbanized areas, 1960
% WWDRK  % employed in white collar occupations
% POOR   % of families with income < $3000
% HC     Relative hydrocarbon pollution potential
% NOX    Same for nitric oxides
% SO@    Same for sulphur dioxide
% HUMID  Annual average % relative humidity at 1pm
% MORT   Total age-adjusted mortality rate per 100,000

@relation pollution

@attribute PREC real
@attribute JANT real
@attribute JULT real
@attribute OVR65 real
@attribute POPN real
@attribute EDUC real
@attribute HOUS real
@attribute DENS real
@attribute NONW real
@attribute WWDRK real
@attribute POOR real
@attribute HC real
@attribute NOX real
@attribute SO@ real
@attribute HUMID real
@attribute MORT real

@data
36.0,27.0,71.0,8.1,3.34,11.4,81.5,3243.0,8.8,42.6,11.7,21.0,15.0,59.0,59.0,921.870
35.0,23.0,72.0,11.1,3.14,11.0,78.8,4281.0,3.5,50.7,14.4,8.0,10.0,39.0,57.0,997.875
44.0,29.0,74.0,10.4,3.21,9.8,81.6,4260.0,0.8,39.4,12.4,6.0,6.0,33.0,54.0,962.354
47.0,45.0,79.0,6.5,3.41,11.1,77.5,3125.0,27.1,50.2,20.6,18.0,8.0,24.0,56.0,982.291
43.0,35.0,77.0,7.6,3.44,9.6,84.6,6441.0,24.4,43.7,14.3,43.0,38.0,206.0,55.0,1071.289
53.0,45.0,80.0,7.7,3.45,10.2,66.8,3325.0,38.5,43.1,25.5,30.0,32.0,72.0,54.0,1030.380
43.0,30.0,74.0,10.9,3.23,12.1,83.9,4679.0,3.5,49.2,11.3,21.0,32.0,62.0,56.0,934.700
45.0,30.0,73.0,9.3,3.29,10.6,86.0,2140.0,5.3,40.4,10.5,6.0,4.0,4.0,56.0,899.529
36.0,24.0,70.0,9.0,3.31,10.5,83.2,6582.0,8.1,42.5,12.6,18.0,12.0,37.0,61.0,1001.902
36.0,27.0,72.0,9.5,3.36,10.7,79.3,4213.0,6.7,41.0,13.2,12.0,7.0,20.0,59.0,912.347
52.0,42.0,79.0,7.7,3.39,9.6,69.2,2302.0,22.2,41.3,24.2,18.0,8.0,27.0,56.0,1017.613
33.0,26.0,76.0,8.6,3.20,10.9,83.4,6122.0,16.3,44.9,10.7,88.0,63.0,278.0,58.0,1024.885
40.0,34.0,77.0,9.2,3.21,10.2,77.0,4101.0,13.0,45.7,15.1,26.0,26.0,146.0,57.0,970.467
35.0,28.0,71.0,8.8,3.29,11.1,86.3,3042.0,14.7,44.6,11.4,31.0,21.0,64.0,60.0,985.950
37.0,31.0,75.0,8.0,3.26,11.9,78.4,4259.0,13.1,49.6,13.9,23.0,9.0,15.0,58.0,958.839
35.0,46.0,85.0,7.1,3.22,11.8,79.9,1441.0,14.8,51.2,16.1,1.0,1.0,1.0,54.0,860.101
36.0,30.0,75.0,7.5,3.35,11.4,81.9,4029.0,12.4,44.0,12.0,6.0,4.0,16.0,58.0,936.234
15.0,30.0,73.0,8.2,3.15,12.2,84.2,4824.0,4.7,53.1,12.7,17.0,8.0,28.0,38.0,871.766
31.0,27.0,74.0,7.2,3.44,10.8,87.0,4834.0,15.8,43.5,13.6,52.0,35.0,124.0,59.0,959.221
30.0,24.0,72.0,6.5,3.53,10.8,79.5,3694.0,13.1,33.8,12.4,11.0,4.0,11.0,61.0,941.181
31.0,45.0,85.0,7.3,3.22,11.4,80.7,1844.0,11.5,48.1,18.5,1.0,1.0,1.0,53.0,891.708
31.0,24.0,72.0,9.0,3.37,10.9,82.8,3226.0,5.1,45.2,12.3,5.0,3.0,10.0,61.0,871.338
42.0,40.0,77.0,6.1,3.45,10.4,71.8,2269.0,22.7,41.4,19.5,8.0,3.0,5.0,53.0,971.122
43.0,27.0,72.0,9.0,3.25,11.5,87.1,2909.0,7.2,51.6, 9.5,7.0,3.0,10.0,56.0,887.466
46.0,55.0,84.0,5.6,3.35,11.4,79.7,2647.0,21.0,46.9,17.9,6.0,5.0,1.0,59.0,952.529
39.0,29.0,75.0,8.7,3.23,11.4,78.6,4412.0,15.6,46.6,13.2,13.0,7.0,33.0,60.0,968.665
35.0,31.0,81.0,9.2,3.10,12.0,78.3,3262.0,12.6,48.6,13.9,7.0,4.0,4.0,55.0,919.729
43.0,32.0,74.0,10.1,3.38,9.5,79.2,3214.0,2.9,43.7,12.0,11.0,7.0,32.0,54.0,844.053
11.0,53.0,68.0,9.2,2.99,12.1,90.6,4700.0,7.8,48.9,12.3,648.0,319.0,130.0,47.0,861.833
30.0,35.0,71.0,8.3,3.37,9.9,77.4,4474.0,13.1,42.6,17.7,38.0,37.0,193.0,57.0,989.265
50.0,42.0,82.0,7.3,3.49,10.4,72.5,3497.0,36.7,43.3,26.4,15.0,18.0,34.0,59.0,1006.490
60.0,67.0,82.0,10.0,2.98,11.5,88.6,4657.0,13.5,47.3,22.4,3.0,1.0,1.0,60.0,861.439
30.0,20.0,69.0,8.8,3.26,11.1,85.4,2934.0,5.8,44.0, 9.4,33.0,23.0,125.0,64.0,929.150
25.0,12.0,73.0,9.2,3.28,12.1,83.1,2095.0,2.0,51.9, 9.8,20.0,11.0,26.0,58.0,857.622
45.0,40.0,80.0,8.3,3.32,10.1,70.3,2682.0,21.0,46.1,24.1,17.0,14.0,78.0,56.0,961.009
46.0,30.0,72.0,10.2,3.16,11.3,83.2,3327.0,8.8,45.3,12.2,4.0,3.0,8.0,58.0,923.234
54.0,54.0,81.0,7.4,3.36,9.7,72.8,3172.0,31.4,45.5,24.2,20.0,17.0,1.0,62.0,1113.156
42.0,33.0,77.0,9.7,3.03,10.7,83.5,7462.0,11.3,48.7,12.4,41.0,26.0,108.0,58.0,994.648
42.0,32.0,76.0,9.1,3.32,10.5,87.5,6092.0,17.5,45.3,13.2,29.0,32.0,161.0,54.0,1015.023
36.0,29.0,72.0,9.5,3.32,10.6,77.6,3437.0,8.1,45.5,13.8,45.0,59.0,263.0,56.0,991.290
37.0,38.0,67.0,11.3,2.99,12.0,81.5,3387.0,3.6,50.3,13.5,56.0,21.0,44.0,73.0,893.991
42.0,29.0,72.0,10.7,3.19,10.1,79.5,3508.0,2.2,38.8,15.7,6.0,4.0,18.0,56.0,938.500
41.0,33.0,77.0,11.2,3.08,9.6,79.9,4843.0,2.7,38.6,14.1,11.0,11.0,89.0,54.0,946.185
44.0,39.0,78.0,8.2,3.32,11.0,79.9,3768.0,28.6,49.5,17.5,12.0,9.0,48.0,53.0,1025.502
32.0,25.0,72.0,10.9,3.21,11.1,82.5,4355.0,5.0,46.4,10.8,7.0,4.0,18.0,60.0,874.281
34.0,32.0,79.0,9.3,3.23,9.7,76.8,5160.0,17.2,45.1,15.3,31.0,15.0,68.0,57.0,953.560
10.0,55.0,70.0,7.3,3.11,12.1,88.9,3033.0,5.9,51.0,14.0,144.0,66.0,20.0,61.0,839.709
18.0,48.0,63.0,9.2,2.92,12.2,87.7,4253.0,13.7,51.2,12.0,311.0,171.0,86.0,71.0,911.701
13.0,49.0,68.0,7.0,3.36,12.2,90.7,2702.0,3.0,51.9, 9.7,105.0,32.0,3.0,71.0,790.733
35.0,40.0,64.0,9.6,3.02,12.2,82.5,3626.0,5.7,54.3,10.1,20.0,7.0,20.0,72.0,899.264
45.0,28.0,74.0,10.6,3.21,11.1,82.6,1883.0,3.4,41.9,12.3,5.0,4.0,20.0,56.0,904.155
38.0,24.0,72.0,9.8,3.34,11.4,78.0,4923.0,3.8,50.5,11.1,8.0,5.0,25.0,61.0,950.672
31.0,26.0,73.0,9.3,3.22,10.7,81.3,3249.0,9.5,43.9,13.6,11.0,7.0,25.0,59.0,972.464
40.0,23.0,71.0,11.3,3.28,10.3,73.8,1671.0,2.5,47.4,13.5,5.0,2.0,11.0,60.0,912.202
41.0,37.0,78.0,6.2,3.25,12.3,89.5,5308.0,25.9,59.7,10.3,65.0,28.0,102.0,52.0,967.803
28.0,32.0,81.0,7.0,3.27,12.1,81.0,3665.0,7.5,51.6,13.2,4.0,2.0,1.0,54.0,823.764
45.0,33.0,76.0,7.7,3.39,11.3,82.2,3152.0,12.1,47.3,10.9,14.0,11.0,42.0,56.0,1003.502
45.0,24.0,70.0,11.8,3.25,11.1,79.8,3678.0,1.0,44.8,14.0,7.0,3.0,8.0,56.0,895.696
42.0,33.0,76.0,9.7,3.22,9.0,76.2,9699.0,4.8,42.2,14.5,8.0,8.0,49.0,54.0,911.817
38.0,28.0,72.0,8.9,3.48,10.7,79.8,3451.0,11.7,37.5,13.0,14.0,13.0,39.0,58.0,954.442