4D v13.4

Std deviation

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4D v13.4
Std deviation

Std deviation 


 

Std deviation ( series ) -> Function result 
Parameter Type   Description
series  Field, Array in Data for which to return the standard deviation
Function result  Real in Standard deviation of series

Std deviation returns the standard deviation of series. If series is an indexed field, the index is used to find the standard deviation.

You can pass an array (one or two dimensions) in series. In this case, the array must be of the Integer, Longint or Real type.

The following example is an object method for the variable vDeviate. The object method assigns the standard deviation for a data series to vDeviate:

 vDeviate:=Std deviation([Table1]DataSeries)

The following method is called to print the records in the selection and to activate break processing:

 ALL RECORDS([Table1])
 ORDER BY([Table1];[Table1]DataSeries;>)
 BREAK LEVEL(1)
 ACCUMULATE([Table1]DataSeries)
 OUTPUT FORM([Table1];"PrintForm")
 PRINT SELECTION([Table1])

Note: The parameter to the BREAK LEVEL command should be equal to the number of breaks in your report. For more information about break processing, refer to the printing commands.

This example gets the standard deviation of a series of values placed in an array:

 ARRAY REAL($ArrGrades;0)
 QUERY([Exams];[Exams]Exam_Date=!01/07/11!)
 SELECTION TO ARRAY([Exams]Exam_Grade;$ArrGrades)
 vStdDev:=Std deviation($ArrGrades)

 
PROPERTIES 

Product: 4D
Theme: On a Series
Number: 26

 
INDEX

Alphabetical list of commands

 
HISTORY 

New
Created: < 4D v6
Modified: 4D v13

 
SEE ALSO 

Average
Sum
Sum squares
Variance