![]() With the logarithmic model type, the formula is:īecause a logarithm is not defined for number less than zero, any marks for which the explanatory variable is negative are filtered before estimation of the model. Where b1 is the slope and b0 is the intercept of the line. With the linear model type the formula is: In the following formulas, X represents the explanatory variable, and Y the response variable. These model types are available for trend lines: Linear, Logarithmic, Exponential, Power, and Polynomial.
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