OPTIONS LS=75 PS=60;

/*
contents of caries.dat

The  data show the caries experience of 7257 children 12-14 years
of age in 21 communities according to the fluoride concentration
of their public water supply.

DMF denotes "Decayed, Missing or Filled".

variables
---------

locality   which community (numbered 1-21)

DMFteeth:  DMT teeth per 100 children
           (so 236 implies an average of 2.36 affected teeth per child)
          
Fluoride   Fluoride Concentration in aprts per million (ppm)


Source: Dean 1942, available at this URL 

http://www.medicine.mcgill.ca/epidemiology/hanley/bios601/principles_of_dental_public_health_fourth_edition/
		
*/

DATA sasuser.caries;
  INPUT  locality  DMFTeeth Fluoride;
LINES;
     1            236            1.9
     2            246            2.6
     3            252            1.8
     4            258            1.2
     5            281            1.2
     6            303            1.2
     7            323            1.3
     8            343            0.9
     9            412            0.6
    10            444            0.5
    11            556            0.4
    12            652            0.3
    13            673            0.0
    14            703            0.2
    15            706            0.1
    16            722            0.0
    17            733            0.2
    18            772            0.1
    19            810            0.0
    20            823            0.1
    21           1037            0.1
;  
PROC PLOT; PLOT DMFTeeth*Fluoride;
PROC REG;
   MODEL DMFTeeth = Fluoride;
RUN;