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median_median_of_a_set_.htm
Navigation:  Templates > Guide to all Templates > Additional Libraries and Templates > Statistics Library >====== MEDIAN (median of a set) ====== Previous pageReturn to chapter overviewNext page

MEDIAN(dataset)

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MEDIAN Returns the middle value of an ordered numeric data set.
dataset The label of a QUEUE with its first component field defined as a REAL.

MEDIAN finds the value which is exactly in the middle when all of the data is in (sorted) order from low to high, or the mean of the two data values which are nearest the middle. The function operates on the numeric set defined by all the entries in the first component of the designated QUEUE (dataset).

For example, given the data set: [1,2,3,4,5] the median is 3, or given the data set: [1,2,4,5] the median is (2 + 4) / 2 = 3.

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The passed data set does not have to be sorted. The function copies the passed set. The passed data set is unchanged.

Return DataType:     REAL

Example:

StatSetX  QUEUE,PRE()

X       REAL

     END

MedianOfSet  REAL

CODE  

FREE(StatSetX)                   !free the QUEUE

CLEAR(STADAT:RECORD)             !clear the record buffer

STADAT:Id = STA:Id               !prime the record buffer

STADAT:ItemNumber = 1

SET(STADAT:KeyIdItemNumber,STADAT:KeyIdItemNumber !position file pointer

LOOP                             !load the QUEUE

  NEXT(StatisticsData)           !read next record

  IF ERRORCODE() OR STADAT:Id NOT = STA:Id

    BREAK

  ELSE

    StatSetX:X = STADAT:X         !load the QUEUE buffer

    ADD(StatSetX)                 !add to the QUEUE

  END

END

MedianOfSet = MEDIAN(StatSetX)    !call MEDIAN

median_median_of_a_set_.htm.txt · Last modified: 2021/04/15 15:57 (external edit)