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May 22nd, 2012, 01:33 PM  #1 
Newbie Joined: May 2012 Posts: 3 Thanks: 0  Calculating a position in a range while limiting the range
Hello I am calculating a position of a values within the range in order to apply the weight to it The idea behind the process is to put all of the values on the same level by flatten them and them multiplying it with the weight. This works fine but I have an issue where 90 % of the values are in the range of 1  1000 but there is one value which is 10000 which raises the ceiling. how can I limit the ceiling to where 90% of the values are? 
May 22nd, 2012, 01:56 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,402 Thanks: 547  Re: Calculating a position in a range while limiting the ran
Your description is too vague.

May 22nd, 2012, 02:25 PM  #3 
Newbie Joined: May 2012 Posts: 3 Thanks: 0  Re: Calculating a position in a range while limiting the ran
OK let me try again: The idea behind the process is to put all of the values on the same level by flatten them and them multiplying it with the weight. Here is the formula: Descending: [Order] when Desc then MaxPrice  isNull(Price, MaxPrice) / MaxPrice  MinPrice Ascending (isNull(Price , MinPrice)  MinPrice)/(MaxPrice MinPrice) Lets say that you have a price range of 1 – 100 and a product price is 40 Asc ( 40  1) / (100  1) = 0.39 Desc. (10040)/(100  1)= 0.60 Meaning when sorting ascending value 40 is in the 39th percentile, or when sorting descending value 40 is in the 60th percentile. This value is then multiplied by a weight of .4 The issue is when the maximum value is an oneoff lats say 10,000 the scale of this column is then thrown off. I want to limit the maximum value to that of the 90% of the members essentially eliminating the one offs. 
May 22nd, 2012, 05:50 PM  #4 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 937 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Calculating a position in a range while limiting the ran
So what's the question? You have the formulas already, just plug the 90th percentile in.

May 23rd, 2012, 06:14 AM  #5 
Newbie Joined: May 2012 Posts: 3 Thanks: 0  Re: Calculating a position in a range while limiting the ran
How do I calculate the maximum value of 90% of all values

May 23rd, 2012, 06:16 AM  #6 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 937 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Calculating a position in a range while limiting the ran
Sort the values, pick the one at the 90th percentile. So if there are 1000 entries, sort them and then pick #100 (or #900, depending on which way you sort).


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