Nothing
setGeneric("cor")
#' Correlation for stranger objects
#'
#' describeIn cor Correlation method for stranger objects.
#' @param x stranger object
#' @param method see help from base \code{cor} function
setMethod("cor",signature(x="stranger"),function(x, method = c("pearson", "kendall", "spearman")){
selectMethod("cor","ANY")(x[,-'.id',with=FALSE],y=NULL, use="everything",method=method)
})
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