I have a data frame with two columns, one of which is a factor
(Species) and the other is numeric (BA, which stands for basal
area). Here's a sample:
Species BA
ACSA 55.7632696
FRAM 122.9933524
ACSA 67.54424205
ACSA 89.22123136
ACSA 82.46680716
ACSA 22.46238747
ACSA 19.94911335
ACSA 20.42035225
ACSA 19.00663555
ACSA 21.67698931
ACSA 57.80530483
ACSA 30.31636911
Dead 43.98229715
Dead 40.21238597
Dead 16.49336143
Dead 40.21238597
Dead 16.49336143
ACSA 78.53981634
VIPR 3.926990817
AEGL 11.78097245
AEGL 0
AEGL 0
ACSA 0
ACSA 0
ACSA 0
VIPR 0
I would like to calculate relative basal area for each species in
this plot. For that, I need to divide the total basal area per
species by the total basal area in the plot. Getting the total basal
area in the plot is easy. However, I'm mystified on how to get the
total basal area per species. Is there a way to extract and/or sum
the total basal area per species?
Thank you in advance.
Jim Milks
Graduate Student
Environmental Sciences Ph.D. Program
Wright State University
3640 Colonel Glenn Hwy
Dayton, OH 45435
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