vardis: Distribution of species attributes in the sample plots

In Zongzheng/forestHES: Forest health evaluation system at the forest stand level in China

Description

To show the distribution od species attributes (such as DBH,tree height) in the sample plots

Usage

vardis(data, varcat = "numeric", plot.id, var, breaks,
include.lowest = FALSE, right = TRUE)

Arguments

data	Data class should be a dataframe, the colnames with plot.id, species name, and some attributes (sucha as DBH,tree height), see data (treedata)
varcat	Catory of species attributes, numeric and character, respectively.
plot.id	Identification number of sample plots
var	Attributes of species in the sample plot
breaks	Either a numeric vector of two or more unique cut points or a single number (greater than or equal to 2) giving the number of intervals into which x is to be cut.See the explanation of breaks of cut function
include.lowest	Labels for the levels of the resulting category. By default, labels are constructed using "(a,b]" interval notation. If labels = FALSE, simple integer codes are returned instead of a factor.See the explanation of include.lowest of cut function
right	Logical, indicating if the intervals should be closed on the right (and open on the left) or vice versa.See the explanation of right of cut function

Value

Distribution od species attributes (such as DBH,tree height) in the sample plots

Author(s)

Zongzheng Chai

Examples

######when variabel catogory is numeric######
####Variable distribution according to the actual range of variable and sizeclass=1
data(treedata)
numericVar.actualsize1<-vardis(treedata,plot.id="plot.id",var="ht.m",
                                breaks=seq(min(treedata$ht.m),max(treedata$ht.m),1))
numericVar.actualsize1
####Variable distribution according to the actual range of variable and sizeclass=2
numericVar.actualsize2<-vardis(treedata,plot.id="plot.id",var="ht.m",
                                breaks=seq(min(treedata$ht.m),max(treedata$ht.m),2))
numericVar.actualsize2
##when the lower value of actual range of variable included,include.lowest can  set TRUE
numericVar.actualInlower<-vardis(treedata,plot.id="plot.id",var="ht.m",
                                  breaks=seq(min(treedata$ht.m),max(treedata$ht.m),1),
                                  include.lowest=TRUE)
numericVar.actualInlower
##when the upper value of actual range of variable excluded,include.lowest can be set FALSE
numericVar.actualExupper<-vardis(treedata,plot.id="plot.id",var="ht.m",
                                  breaks=seq(min(treedata$ht.m),max(treedata$ht.m),1),
                                  right=FALSE)
numericVar.actualExupper

####Variable distribution according to the specific range of variable
range(treedata$ht.m)
##[1]  2.6 32.2
##specific range can be set between 2 and 34, sizeclass is 2
numericVar.specific<-vardis(treedata,plot.id="plot.id",var="ht.m",
                             breaks=2*1:17)
numericVar.specific

######when variabel catogory is character######
characterVar<-vardis(treedata,varcat="character",plot.id="plot.id",var="spe.id")
characterVar

Zongzheng/forestHES documentation built on May 10, 2019, 1:59 a.m.