k-fold partitioning
k-fold partitioning of a data set for model testing purposes. Each record in a matrix (or similar data structure) is randomly assigned to a group. Group numbers are between 1 and k.
kfold(x, k=5, by)
x |
a vector, matrix, data.frame, or Spatial object |
k |
number of groups |
by |
Optional argument. A vector or factor with sub-groups (e.g. species). Its length should be the same as the number of records in x |
a vector with group assignments
Robert J. Hijmans
#library(disdat) #data(NSWtrain) ## a single species #srsp1 <- subset(NSWtrain, spid=='srsp1') #kfold(srsp1, k = 5) ## all species #k = kfold(NSWtrain, k=5, by=NSWtrain$spid) #k[NSWtrain$spid=='srsp1'] ## each group has the same number of records ##(except for adjustments if the number of records divided by k is not an integer) #table(k[NSWtrain$spid=='srsp1']) #k[NSWtrain$spid=='ousp5']
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