code: def removeBelowPercentile(requestContext, seriesList, n):
      
      for s in seriesList:
          s.name = 'removeBelowPercentile(%s, %g)' % (s.name, n)
          s.pathExpression = s.name
          try:
              percentile = nPercentile(requestContext, [s], n)[0][0]
          except IndexError:
              continue
          for (index, val) in enumerate(s):
              if val is None:
                  continue
              if val < percentile:
                  s[index] = None
  
      return seriesList
docs: Removes data below the nth percentile from the series or list of series
      provided. Values below this percentile are assigned a value of None.