Description Usage Arguments Value Author(s) References
Compare two vectors treating NA like any other value.
If both vectors have an NA for that element, the function returns TRUE,
if one has an NA and the other does not, it returns FALSE.
1  | is_same(x, y)
 | 
x, y | 
 vectors to compare  | 
A logical vector: TRUE if both vectors have the same value, including
NA, and FALSE, if they differ.
Winston Chang
http://www.cookbook-r.com/Manipulating_data/Comparing_vectors_or_factors_with_NA/
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