The Sashelp.Gas data set contains data from an experiment about gasoline engine exhaust emissions. Nitrogen oxide emissions from a single-cylinder engine are measured for various combinations of fuel, compression ratio, and equivalence ratio. This data set is used to illustrate fitting models with nonlinearly transformed data. The following steps display information about the Sashelp.Gas data set and create Figure B.8:

title 'Exhaust Emissions Data';
proc contents data=sashelp.Gas varnum;
   ods select position;
run;

title 'The First Five Observations Out of 171';
proc print data=sashelp.Gas(obs=5);
run;

title 'The Fuel Type Variable';
proc freq data=sashelp.Gas;
   tables fuel;
run;