outliers: Detects outliers using values extracted from an environmental...

In biogeo: Point Data Quality Assessment and Coordinate Conversion

Description

Calculates the outliers using the reverse jackknife procedure (see rjack) and boxplot statistics (using boxplot.stats). If the value lies 1.5 times beyond the length of the box in the boxplot then it is considered to be an outlier. This function is used by errorcheck.

Usage

outliers(rid, species, dups, ev)

Arguments

rid	row identifier created in errorcheck
species	column of species names
dups	a column of zeros and ones, where ones indicate duplicates
ev	the values of the environmental variable

Value

values of 1 if records is an outlier and zero if not in two columns. The first column is for the boxplot method and the second is for the reverse jackknife method.

Note

This function is only applied to a species if there are 10 or more records for that species.

Author(s)

Mark Robertson

See Also

errorcheck, boxplot.stats, rjack

Examples

rid<-1:20
species<-rep("Species A",20)
dups=rep(0,20)
ev<-c(rnorm(19,mean=20,sd=1),40)
a<-outliers(rid, species, dups, ev)

biogeo documentation built on May 1, 2019, 8:05 p.m.