Hi all, 
For all you statisticians out there...
I'm working on an algorithm for numeric similarity and would like to 
crowdsource the solution.
Given two numbers, i.e., two observations, how can I get a score between -1 and 
1 indicating their proximity.
I think I need to compute a few things, 
1. Compute the mean of the observations.2. Compute the standard deviation sigma 
of the observations.3. Compute the z-score of each number. 
Once I know the z-score for each number I knew where each number lies along the 
normal distribution.
After that I'm a little lost.  
Is there a notion of difference or sameness after that. 
This might help..
http://www.dkv.columbia.edu/demo/medical_errors_reporting/site010708/module3/0510-similar-numeric.html
Your thoughts are appreciated ? 
Michael Miller.                                           


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