I've put version 184.108.40.206 of the aggregate package on page
This is faster than earlier versions in a number of ways.
More computations are done in C code, this avoids slow operations
on data frames, and this avoids converting objects to factors if
that is not necessary.
2628 31st Ave W, Seattle, WA 98199-3338
(w except Tuesdays)
(resampling, water bottle rockets, computers to Costa Rica, hot shower = 2650 light bulbs, ...)
Help your students understand statistics:
Mathematical Statistics with Resampling and R, Chihara & Hesterberg