RangeSkew - script and chart function

RangeSkew() returns the value corresponding to the skewness of a range of numbers.

Syntax:  

RangeSkew(first_expr[, Expression])

Return data type: numeric

Arguments:  

The argument of this function may contain inter-record functions which in themselves return a list of values.

Argument Description
first_expr The expression or field containing the data to be measured.
Expression Optional expressions or fields containing the range of data to be measured.

Limitations:  

If no numeric value is found, NULL is returned.

Examples and results:  

Examples Results
rangeskew (1,2,4) Returns 0.93521952958283
rangeskew (above(SalesValue,0,3))

Returns a sliding skewness of the range of three values returned from the above() function calculated on the current row and the two rows above the current row.

Data used in example:

CustID RangeSkew(Above(SalesValue,0,3))
1-20

-, -, 0.5676, 0.8455, 1.0127, -0.8741, 1.7243, -1.7186, 1.5518, 1.4332, 0,

1.1066, 1.3458, 1.5636, 1.5439, 0.6952, -0.3766

SalesTable:

LOAD recno() as CustID, * inline [

SalesValue

101

163

126

139

167

86

83

22

32

70

108

124

176

113

95

32

42

92

61

21

] ;