Removes all sites or probes with low variability from the given dataset.
Methylation dataset as an object of type inheriting
Threshold for standard deviation per site. This must be a scalar between 0 and 1. All sites, for
which the standard deviation of methylation values (for all samples in
List of four elements:
The (possibly modified) dataset after removing sites with low variability.
integer vector storing the indices (in beta matrix of the unfiltered
dataset) of all removed sites.
The value of the given parameter
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