User Tools

Site Tools


variancep_variance_of_a_population_.htm
Navigation:  Templates > Guide to all Templates > Additional Libraries and Templates > Statistics Library >====== VARIANCEP (variance of a population) ====== Previous pageReturn to chapter overviewNext page

VARIANCEP(dataset [,meanofset])

blk2blue.jpg

VARIANCEP Returns the variance of the entire population of a numeric set.
dataset The label of a QUEUE with its first component field defined as a REAL.
meanofset A numeric constant or variable representing the average of the data set's values (optional).

VARIANCEP computes the variance of a given population data set. VARIANCES computes the variance of a given sample data set. The 'Population' function call should be used only if the data set contains all of a population's values. The function operates on the numeric set defined by all the entries in the first component of the designated QUEUE (dataset).

The optional parameter helps to optimize the function. If not provided, the value is computed internally by the function.

NoteBox.jpg

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:

StatSetXY       QUEUE,PRE()

X                REAL

               END

VarianceOfSet   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

VarianceOfSet = VARIANCEP(StatSetX) !call VARIANCEP

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