Find a function from values

I'm not very expert in math, but I have a curiosity that could help me many times .. Is there any way to find a function, even just similar, from a set of values?

example: I have some values (x, y):

{(200, 11), (72, 5), (36,3), (28,3), (18,2), (12,2), ...}


what is the function that can return these values and all others who follow this trend on a graph, more easily and better possible?

thank you, hello!

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– Aryabhata Dec 3 '10 at 2:24
@Mo: dunno, that one was a tad simpler since his data already looked awfully linear... but I won't object if people vote to close this one. – J. M. Dec 3 '10 at 2:26
I get these pairs of values from two sensors and would like to find a simple function that describes the relationship between these pairs of numbers and then to estimate the values without having to take each time, but I can not get values in a sequence where x = 1,2,3 , 4 ... as in that question – frx08 Dec 3 '10 at 2:40
@J.M: Yes, I did not cast a close vote because I wasn't sure. – Aryabhata Dec 3 '10 at 5:11
Can you describe exactly what these sensors do? Some people here are very good in physics and might be possible to extract theoretical relations. – AD. Dec 3 '10 at 5:18