Focusing on a linear portion of a non-linear association involves representing data with a linear model and describing the portion using x-values.
Focusing in on a linear portion of a non-linear association allows a linear model to represent part of the data. When focusing on the linear part, it is described using the x-values, not the y-values. It is important to include as much of the data as possible when focusing on the linear part of a non-linear set of data.
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