Split a data.frame into training and test sets.

data_split(data = get_data("german"), varname = "Class", p_test = 0.2,
p_quiz = 0.5)

## Arguments

data
data.frame
varname
string. output variable name
p_test
real. proportion of samples in the test set
p_quiz
real. proportion of samples from the test set in the quiz set

## Value

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