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extrapolation and interpolation

Extrapolation is an estimation of a value based on extending a known sequence of values or facts beyond the area that is certainly known. In a general sense, to extrapolate is to infer something that is not explicitly stated from existing information.

Interpolation is an estimation of a value within two known values in a sequence of values. Polynomial interpolation is a method of estimating values between known data points. When graphical data contains a gap, but data is available on either side of the gap or at a few specific points within the gap, interpolation allows us to estimate the values within the gap.

See a brief tutorial on extrapolation and interpolation:

This was last updated in September 2015

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Excellent explanation; concise, simple & instructional. Thanks for very good information!
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looks good, thank you
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Better than my teacher! Thanks a lot!
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This video was really worth the slap to the face my mom gave me after I said I didn't understand what the teacher said the first time that this concept was introduced to me!
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