Interpolation and Extrapolation

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To perform interpolation or extrapolation for a specific unobserved value, you need to find the two closest observed values and calculate the corresponding expected value on the other axis. Here is how.
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Excellent tutorial. Ultra helpful, and easy to follow.

LUMIGOCHA
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How do you fix the two red lines for the interpolation?

stevennkenn
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Very helpfull and easy to learn.... thanks Doc....

indonesianreject
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Thank-you for this informative lecture. I want to share you something, Currently I'm working on Data Compression and Reconstruction techniques through interpolation. I was given 20, 000 data points and I compressed those point into 244 data points. Now I want reconstruct the data from 244 data points to 20, 000 data points through interpolation but got stuck .... Can you assist me regarding reconstruction ?
I will be waiting for your kind response.
Regards

muhammadrizvi