Add a variable sum_weight to the dataset weights. This variable contains the sum of the shell, gut and meat weight. Also add a variable Ploss that contains the fraction of the total weight that was lost by bleeding.

 

   gender total_weight meat_weight gut_weight shell_weight
1       M       0.5140      0.2245     0.1010        0.150
2       M       0.2255      0.0995     0.0485        0.070
3       F       0.6770      0.2565     0.1415        0.210
4       M       0.5160      0.2155     0.1140        0.155
5       I       0.2050      0.0895     0.0395        0.055
6       I       0.3515      0.1410     0.0775        0.120
7       F       0.7775      0.2370     0.1415        0.330
8       F       0.7680      0.2940     0.1495        0.260
9       M       0.5095      0.2165     0.1125        0.165
10      F       0.8945      0.3145     0.1510        0.320