[SPARK-825] DoubleRDDFunctions.sampleStdev() actually computes regular stdev()

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.6.0, 0.6.1, 0.6.2, 0.7.0, 0.7.1, 0.7.2, 0.7.3, 0.8.0
• Fix Version/s: 0.7.3, 0.8.0
• Component/s: Spark Core
• Assignee: Josh Rosen
• Reporter: Josh Rosen
• Created: 22/Jul/13 13:09
• Updated: 30/Mar/14 23:33
• Resolved: 22/Jul/13 16:09

Description

Due to a typo, DoubleRDDFunctions.sampleStdev() returns the regular, non-sample stdev():

  /** 
   * Compute the sample standard deviation of this RDD's elements (which corrects for bias in
   * estimating the standard deviation by dividing by N-1 instead of N).
   */
  def sampleStdev(): Double = stats().stdev