def standardize use_population=false
          m ||= mean
          sd = use_population ? sdp : sds
          return Daru::Vector.new([nil]*size) if m.nil? || sd == 0.0

          vector_standardized_compute m, sd
        end
Standardize data.

== Arguments

* use_population - Pass as *true* if you want to use population
standard deviation instead of sample standard deviation.