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 FileMaker Pro Custom Functions

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ValStdDev( ValueList ; ArithMeanValue )

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Bill Thurmes, Miyota Development Center of America
https://www.miyotadca.com/

Gives the standard deviation of a value List of numbers

Sample Input:
Example: ValStdDev ( "5¶8¶24¶3¶6" ; ValueMean ( "5¶8¶24¶3¶6" ) )
ValStdDev ( "5¶a¶24¶3¶6" ; ValueMean ( "5¶a¶24¶3¶6" ) )
Sample Output:
= 7.5736...

= 8.45221... [GetAsNumber sees 'a' as 0]


 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed

Description:

The native StDev function in FileMaker only works on fields, but it is often more efficient to work with value lists and do all calculations in memory. This is particularly true when you use ESQL, where the answer is returned as a value list. The ValStdDev function gives the standard deviation of a set of numerical values in a ¶-delimited value list. This uses the square root of (the sum of squares divided by N); for many uses, ValStdDevS (which uses N-1) is more appropriate. One caveat: if a non-numerical value is used, it is evaluated as 0.

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

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