importance | R Documentation |
For a classified set of vegetation samples, a importance table lists for each species the average or typical abundance of each species in each class.
importance(comm,clustering,minval=0,digits=2,show=minval,
sort=FALSE,typical=TRUE,spcord,dots=TRUE)
comm |
a data.frame of species abundances with samples as rows and species as columns |
clustering |
a vector of (integer) class memberships, or an object of
class ‘clustering’, class ‘partana’,
of class |
minval |
the minimum importance a species must have in at least one class to be included in the output |
digits |
the number of digits to report in the table |
show |
the minimum value a species must have to print a value |
sort |
a switch to control interactive re-ordering |
typical |
a switch to control how mean abundance is calculated. Typical=TRUE divides the sum of species abundance by the number of plots in which it occurs; typical=FALSE divides by the number of plots in the type |
spcord |
a vector of integers to specify the order in which species should be listed in the table |
dots |
a switch to control substituting dots for small values |
a data.frame with species as rows, classes as columns, with average abundance of species in classes.
Importance tables are often used in vegetation classification to
calculate or present characteristic species for specific classes or types.
Importance may be combined with const
,
concov
and vegtab
to achieve a
vegetation table-oriented analysis.
David W. Roberts droberts@montana.edu
const
, vegtab
,
concov
data(bryceveg) # returns a data.frame called bryceveg
data(brycesite)
class <- cut(brycesite$elev,10,labels=FALSE)
importance(bryceveg,class,minval=0.25)
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