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Segregating data in bimodal distribution [message #77151]

Wed, 03 August 2011 05:35

Eric Hudson
Messages: 19
Registered: June 2006

Junior Member

Hi,

Is anyone aware of an IDL implemented algorithm for segregating data
in a bimodal distribution into two groups?

My data is such that I could do it manually (make a histogram, decide
on a threshold between the two peaks in the histogram, then pull out
the data above and below that into two separate groups). There isn't
a true gap between the two peaks, but they are pretty well separated.
The part which is non-obvious to me is to how to programmatically
choose the threshold value. And since I have to do this on many data
sets, where the threshold is going to be different for each, I prefer
to not do it manually.

Thanks,
Eric

PS In searching I found something called the KMM algorithm which
seems like it would work, but I haven't found code for it.

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