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is a factor a likert scale
is_likert(vec, lev)
a factor
le scale
boolean
# NOT RUN { is_likert(iris$Species,c("setosa","versicolor","virginica")) is_likert(iris$Species,c("setosa","versicolor","virginica","banana")) is_likert(iris$Species,c("setosa","versicolor")) # }
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