Skew - script function

Skew() returns the skewness of expression over a number of records as defined by a group by clause.

Syntax:  

Skew([ distinct] expr)

Return data type: numeric

Arguments:  

Argument Description
expr The expression or field containing the data to be measured.
DISTINCT If the word distinct occurs before the expression, all duplicates will be disregarded.

Examples and results:  

Add the example script to your app and run it. Then build a straight table with Type and MySkew as dimensions.

Example Result

Table1:

crosstable LOAD recno() as ID, * inline [

Observation|Comparison

35|2

40|27

12|38

15|31

21|1

14|19

46|1

10|34

28|3

48|1

16|2

30|3

32|2

48|1

31|2

22|1

12|3

39|29

19|37

25|2 ] (delimiter is '|');

 

Skew1:

LOAD Type,

Skew(Value) as MySkew

Resident Table1 Group By Type;

 

The results of the Skew() calculation in the data load script are:

  • Type is MySkew
  • Comparison is 0.86414768
  • Observation is 0.32625351