Nothing

```
##############################################################################
# Copyright (c) 2008-2010, 2012-2016 Russell V. Lenth #
# #
# This file is part of the rsm package for R (*rsm*) #
# #
# *rsm* is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 2 of the License, or #
# (at your option) any later version. #
# #
# *rsm* is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# A copy of the GNU General Public License is available at #
# <https://www.r-project.org/Licenses/> #
##############################################################################
### Find good ccds
ccd.pick = function(k, n.c=2^k, n0.c=1:10, blks.c=1, n0.s=1:10,
bbr.c=1, wbr.s=1, bbr.s=1, best=10,
sortby=c("agreement","N"), restrict)
{
grid = expand.grid (n.c=n.c, n0.c=n0.c, blks.c=blks.c, n.s=NA, n0.s=n0.s, bbr.c=bbr.c, wbr.s=wbr.s, bbr.s=bbr.s)
grid$n.s = 2 * k * grid$wbr.s
grid$N = with(grid, blks.c * bbr.c * (n.c + n0.c) + bbr.s * (2 * k * wbr.s + n0.s))
grid$alpha.rot = (with(grid, n.c * blks.c * bbr.c / (wbr.s * bbr.s))) ^ .25
num = with(grid, n.c * (2 * k * wbr.s + n0.s))
den = with(grid, 2 * wbr.s * (n.c + n0.c))
grid$alpha.orth = sqrt(num / den)
agreement = with(grid, abs(log(alpha.rot / alpha.orth)))
# remove combinations that don't have enough d.f.
extra.df = with(grid, n.c * blks.c - (k * (k + 1)/2 + blks.c))
grid = grid[extra.df >= 0, ]
if (!missing(restrict))
for (restr in restrict) {
r = with(grid, eval(parse(text=restr)))
grid = grid[r,]
}
# regenerate 'agreement' in case # rows changed
agreement = with(grid, abs(log(alpha.rot / alpha.orth)))
if (!is.null(sortby)) {
keys = list()
for (key in sortby)
keys[[key]] = with(grid, eval(parse(text=key)))
ord = do.call("order", keys)
}
else
ord = 1:nrow(grid)
lim = min(best, nrow(grid))
ans = grid[ord[1:lim], ]
row.names(ans) = 1:lim
ans
}
```

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