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Polynomial Regression models the relationship between the input variables with an nth-degree polynomial. The linear regression calculator only fits a straight line to input data. The exponential regression calculator models the relationship between the input data as an exponential function

Polynomial regression is a useful tool when the relationship between the input data can be modeled accurately with a polynomial function. If the relationship can be better modeled with a straight line, then the linear regression calculator would be a more useful tool. If it looks like there is an exponential relationship between the input data then the exponential regression calculator is a better tool to use.