The current implementation should allow updates to the past, but it will only ever give you an average at the latest data point.
On Tue, May 17, 2011 at 11:33 AM, Dmitriy Lyubimov (JIRA) <[email protected]>wrote: > I am also using this with slight modifications to enable to use with > map-reduce. 2 suggestions i implemented on a side: updates to the past > (unordered input w.r.t. to time of sampling, albeit potentially less > numerically stable) and combining to use with MR. > http://weatheringthrutechdays.blogspot.com/2011/04/follow-up-for-mean-summarizer-post.html. > No algorithm in Mahout currently uses MR for summarizing inputs but it > might. These improvements allowed to implement Pig functions that run that > formulas. >
