A variable y is a function of x That is y fx I have a table

A variable y, is a function of x. That is:

y = f(x)

I have a table of values of x, from 0 to 1000, and the corresponding values of y.

I want to do curve fitting, and get the equation y = f(x). However, I\'m only interested in the region of x from 100 to 500.

Would it be more accurate to do the curve fitting only for my desired range? Or should I take the whole range?

Take the whole range for curve fitting