testify: Transform any test function into a valid test function for the table
Description
Transform a function into a valid test function for the table
Applying the function on a numerical vector should return one value
Applying the function on a factor should return nlevels + 1 value, or one value per factor level
Usage
testify(x, f, group)
Arguments
x
A vector
f
The function to try to apply, or a formula combining two functions
group
Grouping factor
Value
The results for the function applied on the vector, compatible with the format of the result table