[R] correlation

kdebusk kdebusk at gmail.com
Thu Oct 16 15:05:25 CEST 2008

What test do I use to determine if there is a correlation between a
discrete variable and a continuous variable?

For example - I have water quality ratings for streams (excellent,
good, fair, poor) and a corresponding nitrogen concentration for each
rating. I want to know if the the ratings correlate with the
concentration of nitrogen in the stream.


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