Regression small numbers

[FrankM]

I have a set of numbers, one side of the set is a larger number relative to the other one, but the changes to the one side are small relative to the other. Is it permissible to work with the residual to establish a trend line for the small changes?

 

21.720840 1.000058954

25.321081 1.000080116

29.518064 1.000108876

34.410700 1.000147960

40.114292 1.000201074

46.763259 1.000273254

54.514295 1.000371346

63.550070 1.000504649

74.083529 1.000685805

 

Can I subtract 1 and then strip off 3 decimals in the right column and work with that and the left column to establish a curve fit for the residual changes in the right column? Does this in anyway invalidate the curve fit?