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August 29th, 2015, 12:00 PM  #1 
Newbie Joined: Aug 2015 From: India Posts: 4 Thanks: 0  Relation between two sets of data
I am struggling to find the relation between two set of numbers, I have the following relation. I need to find an equation or a way to establish the relation in between these values x1 x2 A 339 1073 B 0 90 y1 y2 C 521 103 D 0 1 In the first set, when x1 shows as 339 its actual value is 0 (Row B) and when 1073 it is 90. What I am trying to find is an equation or a way to calculate the values for say 500 in first row A. The data in the second row (ie, 090) is fixed but the values between 3391073 will change. I want to find the value value between 090 when the value in the first row is specified. Say, if the value in row A is 500, what will be its equivalent value in row B. Similarly, I want to find a relation in the y series. Can someone help me or lead me in the right direction? 
August 29th, 2015, 12:07 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 19,708 Thanks: 1805 
Where do these values come from?

August 29th, 2015, 12:16 PM  #3 
Newbie Joined: Aug 2015 From: India Posts: 4 Thanks: 0  
August 29th, 2015, 01:12 PM  #4 
Global Moderator Joined: May 2007 Posts: 6,607 Thanks: 616 
The simplest solution is a straight line fit.

August 29th, 2015, 01:48 PM  #5 
Newbie Joined: Aug 2015 From: India Posts: 4 Thanks: 0  You mean like using a straight line equation, y = mx + c. I thought about that at first but since I have only two values, fitting a line between those two points will lead to a lot of inaccuracy. Is there a better solution than that? Please. Last edited by aspn; August 29th, 2015 at 02:04 PM. 
August 30th, 2015, 12:26 AM  #6  
Senior Member Joined: Jun 2015 From: England Posts: 887 Thanks: 266  Quote:
If you can't be bothered to tell us the full story then you are wasting your own time as well as everyone else's.  
August 30th, 2015, 01:04 PM  #7 
Global Moderator Joined: May 2007 Posts: 6,607 Thanks: 616  If you have only two values, a straight line fit will be exact for these two values.

September 1st, 2015, 09:44 AM  #8 
Newbie Joined: Aug 2015 From: India Posts: 4 Thanks: 0  I agree. I used the straight line fit and I am getting expected results. Thank you very much for your help.
Last edited by aspn; September 1st, 2015 at 09:46 AM. 

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