hidden function used to clean-up an unmarked data.frame (umdf) by dropping any NA columns attributed by scrub_imbcr_df(), mean-center (scale) our site covariates (but not sampling effort!), and do some optional quantile filtering that drops covariates with low variance, which is a useful 'significance pruning' precursor for principal components analysis. Prefer dropping the NA bin here (rather than in scrub_imbcr_df), so that we still have an accurate account of total sampling effort to attribute in scrub_unmarked_dataframe().
1 2 | scrub_unmarked_dataframe(x = NULL, normalize = T,
prune_cutoff = NULL)
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