Data management/Exploration & description

By right clicking TOTYLD and YLD210 in turn and selecting Column Attributes… we can change the number of decimals to zero to make these lactation yields whole numbers. 

We next produce a box plot for total yield. As we can see there are a number of cows with somewhat higher total yield offtakes than the others. 

But this diagram ignores the effect of herd and herd group.