[kepler-dev] [Bug 2044] New: - R actor for means and error by group

[bugzilla-daemon@ecoinformatics.org]

http://bugzilla.ecoinformatics.org/show_bug.cgi?id=2044

           Summary: R actor for means and error by group
           Product: Kepler
           Version: 1.0.0alpha5
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: actors
        AssignedTo: higgins at nceas.ucsb.edu
        ReportedBy: jones at nceas.ucsb.edu
         QAContact: kepler-dev at ecoinformatics.org


This bug is to create an actor that wraps an R script (using the generic R actor
described in bug #1342) for calculating the mean, standard deviation, and
standard error of a numeric variable that is passed into the script.  Optionally
the stats should be calculated using a grouping variable (by group), with one
mean/std/se for each group.

There are two inputs:
  1) dataValue (type double)
  2) group (type string)

The actor will accululate all data passed in as a series of {dataValue, group}
tuples and pass this along to R to calculate the mean, stdev, and stderr by
group.  If group is not present then the tuples will be {dataValue}.  When the R
script is finished, a matrix of {group, mean, stdev, stderr} will be passed back
to the R actor and then emitted on the output port.  So for N tokens that come
in on the input port the actor will output on 1 token on the output port after
all input data has been received (this is a grouping operation).