Blackmore data frame has 945 rows and 4 columns.
Blackmore and Davis's data on exercise histories of 138 teenaged
girls hospitalized for eating disorders and 98 control subjects.
This data frame contains the following columns:
a factor with subject id codes.
age in years.
hours per week of exercise.
a factor with levels:
control, Control subjects;
patient, Eating-disordered patients.
Personal communication from Elizabeth Blackmore and Caroline Davis, York University.