trini_mod
trini_mod$group
groups(trini_mod)
filter_by_group(trini_mod, stream == "LL", transect == "transect.1")
filter_by_group(trini_mod, transect == "transect.1")
if (FALSE) {
# The code below would raise an error because there is no "color" grouping variable.
filter_by_group(trini_mod, color == "red")
}
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