Hi,

Thanks for the feedback. I have tried it on the small size sample and ref
and it works. Now I want to use a larger dataset for myref (the reference
file) . The reference file contains 112189 rows. Can I use the same approach
that works for the small example? Or are there other alternatives when
dealing with data of that magnitude?


-- 
Suhaila Zainudin
PhD Candidate
Universiti Teknologi Malaysia

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