MEDIAN

MEDIAN

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The MEDIAN field qualifier keyword causes a field to be reported together with its median average value.

 

 

Format

 

MEDIAN field {field.qualifiers} {NO.NULLS}

 

where

 

fieldis the field or evaluated expression to be displayed.

 

field.qualifiers are other field qualifying keywords

 

NO.NULLScauses null values to be ignored.

 

 

The MEDIAN field qualifier keyword is placed before the field name to which it applies and causes the query processor to report the value of the field for each record processed and also to report the median value (the midpoint value) at the end of the report. Used with breakpoints, the MEDIAN keyword will also report the median value of the field at each breakpoint.

 

If the field is defined as multivalued, the MEDIAN keyword operates on each value in turn.

 

The MEDIAN keyword operates only on numeric data. Non-numeric values are ignored except that the default behaviour is to treat null items as zero. The NO.NULLS keyword can be used to prevent null values being included in the calculation of the median value.

 

The median is defined as the middle value in a sorted list of all values, including repeated values, in the data being averaged. Where there are an even number of values, the median value is the average of the two values in the centre of the list.

 

 

Example

 

The sentence

 

LIST INVOICES MEDIAN VALUE CUSTOMER.NAME WITH NO AMT.PAID

 

would produce a display such as that below in which the median value of the VALUE field is included at the end of the report.

 

LIST INVOICES MEDIAN VALUE CUSTOMER.NAME WITH NO AMT.PAID

Invoice  ...Value  Customer...................

74529    £1712.43  J McTavish

74273      £95.23  County Newspapers

28137      £26.20  J Higgins

63940     £141.00  R Bryant

74993       £9.29  Write Right Stationery

        ========

          £95.23

5 records listed.

 

 

See also:

AVERAGE, MODE, RANGE