‰HDF  ÿÿÿÿÿÿÿÿ0Lÿÿÿÿÿÿÿÿ`ˆ¨ °TREEÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ� HEAPX Èdatadata_descr8ˆ¨ 0name pollution (mldata0 (commentData 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 100,000ø TREEÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿè HEAPX8 double0HSNODÐ0, ?@4 4ÿ<0ÖÕLxSNODØ 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