# How can you determine whether a linear, exponential, or quadratic function best models data?

How can you determine whether a linear, exponential, or quadratic function best models data?
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Arham Warner
If the 1st differences of consecutive y-values are constant or very nearly constant then a linear model will probably fit well.
If the 1st differences are not constant then use those numbers to find the 2nd differences. If they are constsnt or nearly constant then a quadratic model will probably fit well/
If the ratios of consecutive y-values are constant or very nearly constant then an exponential model will likely work well.