File size: 2,110 Bytes
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// Call gtools plugin
`Factor' __factor_gtools(
`Varlist' vars,
`String' touse,
`Boolean' verbose,
`Boolean' sort_levels,
`Boolean' count_levels,
`Boolean' save_keys)
{
`Factor' F
`Integer' num_vars, num_levels, num_obs
`String' levels_var, tag_var, counts_var, cmd, if_cmd, counts_cmd
`Vector' levels, counts, idx
`Matrix' keys
// Options
if (verbose == .) verbose = 0
if (sort_levels == .) sort_levels = 1
if (count_levels == .) count_levels = 1
if (save_keys == .) save_keys = 1
assert_msg(count_levels == 0 | count_levels == 1, "count_levels")
assert_msg(save_keys == 0 | save_keys == 1, "save_keys")
// Load data, based on output from -gegen group-
levels_var = st_tempname()
counts_var = st_tempname()
// Run gegen group() from Stata
if_cmd = touse == "" ? "" : " if " + touse
counts_cmd = count_levels ? sprintf("counts(%s) fill(data)", counts_var) : ""
cmd = "gegen long %s = group(%s)%s, missing %s"
cmd = sprintf(cmd, levels_var, invtokens(vars), if_cmd, counts_cmd)
if (verbose) printf(cmd + "\n")
stata(cmd)
num_levels = st_numscalar("r(J)")
num_obs = st_numscalar("r(N)")
num_vars = cols(vars)
levels = st_data(., levels_var, touse)
if (count_levels) {
counts = st_data( (1,num_levels) , counts_var, .)
}
if (save_keys) {
idx = J(num_levels, 1, .)
idx[levels] = 1::num_obs
keys = st_data(idx, vars, touse)
}
if (count_levels) assert_msg(num_levels == rows(counts), "num_levels")
assert_msg(num_obs == rows(levels), "num_obs")
assert_msg(num_obs > 0, "no observations")
assert_msg(num_vars > 0, "no variables")
F = Factor()
F.num_levels = num_levels
F.num_obs = num_obs
if (save_keys) swap(F.keys, keys)
swap(F.levels, levels)
swap(F.counts, counts)
F.method = "gtools"
assert_msg(rows(F.levels) == F.num_obs & cols(F.levels) == 1, "levels")
if (save_keys==1) assert_msg(rows(F.keys) == F.num_levels, "keys")
if (count_levels) assert_msg(rows(F.counts)==F.num_levels & cols(F.counts)==1, "counts")
F.is_sorted = 0
return(F)
}
end
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