When would linear extrapolation be more useful than linear interpolation?

1 Answer
Feb 21, 2015

Some definitions first:
Linear interpolation : finding a point between two known data points under the assumption that the domain and range are linked by some linear function.

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Linear extrapolation : finding a point beyond the known set of data points.

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As the second example shows, linear extrapolation can be used by establishing a tangent line to the last known data point even when the data points are non-linear.