Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18481#discussion_r125154492
--- Diff: R/pkg/R/functions.R ---
@@ -2871,10 +2874,10 @@ setMethod("ifelse",
#' @details
#' \code{cume_dist}: Returns the cumulative distribution of values within
a window partition,
-#' i.e. the fraction of rows that are below the current row.
-#' N = total number of rows in the partition
-#' cume_dist(x) = number of values before (and including) x / N
+#' i.e. the fraction of rows that are below the current row:
+#' number of values before (and including) x / total number of rows in the
partition.
--- End diff --
with that many words it seems the fact this is a formula is lost. how about
this like the other formula
```
(number of values before and including x) / (total number of rows in the
partition)
```
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