importFrom(plyr, 
  ddply,
  llply,
  ldply,
  dlply,
  join
)

importFrom(reshape, 
  melt,
  melt.data.frame
)

importFrom(Hmisc, 
  wtd.mean, 
  wtd.var, 
  wtd.quantile, 
  wtd.rank, 
  wtd.table
)

exportPattern("^[^\\.]")
