First six rows of data frame df. The data frame contains actual weight in kilograms and actual height in centimeters of male and female (sex) subjects.
subject sex weight height repwt repht
s001 Male 77 182 77 180
s002 Female 58 161 51 159
s003 Female 53 161 54 158
s004 Male 68 177 70 175
s005 Female 59 157 59 155
s006 Male 76 170 76 165