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

BolkowN

BolkowN

Answered question

2021-07-03

How do you tell which function—linear, exponential, or quadratic—best represents data?

Answer & Explanation

Arham Warner

Arham Warner

Skilled2021-07-04Added 102 answers

A linear model will likely fit well if the first differences between consecutive y-values are constant or very close to constant.
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.

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