I had to compute the SD for some numbers recently, so after figuring out
what Standard Deviation is (thanks to my brother), I whipped up this code
if anyone is interested:
<!--- Usage <cf_sd list="162.5,163.6,165.2"> --->
<CFPARAM NAME="Attributes.List" DEFAULT="162.5,163.6,165.2">
<CFSCRIPT>
// Convert list to array and set values
ThisArray = ListToArray(Attributes.List); Total = ArraySum(ThisArray);
Average = ArrayAvg(ThisArray); Items = ArrayLen(ThisArray); SDTotal = 0;
// Compute Standard Deviation Total
for(Loop=1 ; Loop LTE Items; Loop=Loop+1) { SDTotal = SDTotal +
(ThisArray[Loop] - Average)^2; }
// Output variables
Caller.Average = Average;
Caller.Variance = (SDTotal / Items);
Caller.SD = SQR(Caller.Variance);
</CFSCRIPT>
<CFOUTPUT><P>Average: #Caller.Average#<BR>Variance:
#Caller.Variance#<BR>Standard Deviation: #Caller.SD#</P></CFOUTPUT>
Of course, I then found CF_StandardDeviation in the Developer's Exchange,
but mine is shorter. ;p
Tony Schreiber, Senior Partner Man and Machine, Limited
mailto:[EMAIL PROTECTED] http://www.technocraft.com
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