topic Re: Normal Distribution in DIAdem

Normal Distribution

MartinMcD — Thu, 14 Feb 2013 14:14:48 GMT

Hello there,

I'm trying to calculate the normal distribution for a channel in DIAdem, without much luck. I've seen the example at the location below but I don't understand it. Does anybody have a simple/commented example that you wouldn't mind sharing please?

http://forums.ni.com/t5/DIAdem/DIAdem-2010-Advanced-Edition/td-p/1622394

Thank you,

Martin

http://forums.ni.com/t5/DIAdem/DIAdem-2010-Advanced-Edition/td-p/1622394

Re: Normal Distribution

MartinMcD — Thu, 14 Feb 2013 16:35:42 GMT

This is what I have so far, I'd be pleased to hear any feedback.

Thank you,

Martin

'Create the histogram classes
ClassNo          = 40
ClassBegin       = -5
ClassEnd         = 40
ClassWidth       = 1.125
ClassRangeWidth = 45
ClassChn         = "[1]/Noname"
Call ChnHistogram("/On Time","/ClassMean","/SampleCount","NoBeginEnd","absolute")

'Build the CDF:
formula = "Ch(""/Result"")= SND( (Ch(""/ClassMean"") - mean ) / stdev)"
symbols(1) = "mean"
symbols(2) = "stdev"
values(1) = Data.Root.ActiveChannelGroup.Channels("On Time").Properties("ResultStatArithMean").Value
values(2) = Data.Root.ActiveChannelGroup.Channels("On Time").Properties("ResultStatDeviation").Value
Call Calculate ( formula, symbols, values )

'Differentiate to get the PDF
Call ChnDifferentiate("/ClassMean","/Result","/DifferentiatedX","/DifferentiatedY")

Re: Normal Distribution

Walter_Rick — Fri, 15 Feb 2013 07:10:32 GMT

Hi MartinMcD,

Are you looking for this:

Greetings

Walter

Re: Normal Distribution

MartinMcD — Fri, 15 Feb 2013 11:49:01 GMT

Great, thank you Walter.

All the best,

Martin