Percentrank in actual help:
Syntax: PERCENTRANK( NumberSequenceList Data ; Number X [ ; Integer Significance = 3 ] )
parameter Significance not mentioned.
User Profile Reset: No
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:50.0) Gecko/20100101 Firefox/50.0
Gabor: one for you?
Gabor Kelemen committed a patch related to this issue.
It has been pushed to "master":
tdf#104975 Document Significance parameter of PERCENTRANK
Created attachment 130042 [details]
Percentrank in the Formula Wizard
A problem left is that the Formula Wizard still does not always know about the third parameter. This is on 5.4 master.
Let me close this and continue with the Formula Wizard problem in a different bug.