Displaying 2 results from an estimated 2 matches for "macroinvertebrate".
2008 Oct 17
1
ggplot2 scale relation free
...t the previous
two are surely related to the last (this ratio has been suggested to
show nutrient limitation, but there is the possibility that the
concentrations of the two constituents are high enough where the ratio
is not that meaningful). Or maybe when particulate organic carbon is
related to macroinvertebrate density with scales as divergent as 1mg/L
to 1000insects/m^2 . The good parts about base graphics are that you
can do anything you want to even if it is wrong, but I'm responsible
for my actions or assumptions. ggplot is a wonderful piece of
software and most of its defaults are wonderful, bu...
2008 Oct 16
3
correlation
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.
Help?