[Insight-users] Basic Statistics Algorithms

[Karthik Krishnan]

A list sample can contain "m" measurements where each measurement is 
unique and have a frequency of 1. That is the way things are represented 
in the class .

A representation that bins/compartmentalizes these measuements in N-D 
space is the Histogram class. Each bin can have a frequency depending on 
the number of measurements that fall in it. 

You could use the ListSampleToHistogramGenerator to generate a histogram of your measurements and then query the histogram for the Mode value.

-karthik




Bradley Lowekamp wrote:

>
> I am working with the results of a watershed segmentation and starting 
> to run some statistics on certain regions of my image. From these 
> small sample regions I have created ListSample. I would like the 
> frequency of the most frequent sample in the list. I have discovered 
> that the SampleList can have multiple entries with the same 
> Measurement Vector each with a frequency of one. I feel like there 
> should be some building blocks in ITK statistics to help me with this 
> simple task. What am I missing?
>
> Is there a Count algorithm?
> What about Min Max?
> A unique sample list which makes better use of the frequency would be 
> helpful as well.
>
> Is this functionality already in ITK? If not is there a reason it is not?
>
> Thanks,
> Brad
>
>
>
> ========================================================
>
> Bradley Lowekamp  
>
> Management Systems Designers Contractor for
>
> Office of High Performance Computing and Communications
>
> National Library of Medicine 
>
> blowekamp at mail.nih.gov <mailto:blowekamp at mail.nih.gov>
>
>
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