However , if the slope varies over the range of the plot , one may need to adjust the model to be :
If the plot is essentially flat , i.e. , zero slope , then it is reasonable to assume a constant amplitude in the non-linear model .
If the slope varies over the range of the plot , one may need to adjust the model to be :
If the plot is essentially flat , i.e. , zero slope , then it is reasonable to assume a constant amplitude in the non-linear model .