Even more common than grouping columns is probably grouping data by rows. The htmlTable allows you to do this by
tspanner. The most common approach is by using
rgroupas the first row-grouping element but with larger tables you frequently want to separate concepts into separate sections. Here’s a more complex example. This has previously been a little cumbersome to to counting the rows of each tspanner but now you’re able to (1) leave out the last row, (2) specify the number of rgroups instead of the number of rows. The latter is convenient as the
n.tspannermust align with the underlying rgroup.
I haven’t used this package before, but it does look interesting. H/T R-bloggers