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Get outliers from multivariate functional data
using the functional boxplot with the
modified band depth of Sun et al. (2011, 2012).
This function relies on the fbplot function
of the roahd package.
get_outliers_mfd(mfdobj)A numeric vector with the indexes of the functional observations signaled as outliers.
A multivariate functional data object of class mfd
Sun, Y., & Genton, M. G. (2011). Functional boxplots. Journal of Computational and Graphical Statistics, 20(2), 316-334.
Sun, Y., & Genton, M. G. (2012). Adjusted functional boxplots for spatio-temporal data visualization and outlier detection. Environmetrics, 23(1), 54-64.
library(funcharts)
data("air")
air <- lapply(air, function(x) x[1:20, , drop = FALSE])
fun_covariates <- c("CO", "temperature")
mfdobj_x <- get_mfd_list(air[fun_covariates], lambda = 1e-2)
get_outliers_mfd(mfdobj_x)
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