Description Usage Arguments Value Examples
Detecting multivariate outliers using the Minimum Covariance Determinant approach
1 | outliers_mcd(x, h, alpha, na.rm)
|
x |
matrix of bivariate values from which we want to compute outliers |
h |
proportion of dataset to use in order to compute sample means and covariances |
alpha |
nominal type I error probability (by default .01) |
na.rm |
set whether Missing Values should be excluded (na.rm = TRUE) or not (na.rm = FALSE) - defaults to TRUE |
Returns Call, Max distance, number of outliers
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | #### Run outliers_mcd
# The default is to use 75% of the datasets in order to compute sample means and covariances
# This proportion equals 1-breakdown points (i.e. h = .75 <--> breakdown points = .25)
# This breakdown points is encouraged by Leys et al. (2018)
data(Attacks)
SOC <- rowMeans(Attacks[,c("soc1r","soc2r","soc3r","soc4","soc5","soc6","soc7r",
"soc8","soc9","soc10r","soc11","soc12","soc13")])
HSC <- rowMeans(Attacks[,22:46])
res <- outliers_mcd(x = cbind(SOC,HSC), h = .75)
res
# Moreover, a list of elements can be extracted from the function,
# such as the position of outliers in the dataset
# and the coordinates of outliers
res$outliers_pos
res$outliers_val
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