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Programming Tips
Rick Wicklin 0
Bilinear interpolation in SAS

This article shows how to perform two-dimensional bilinear interpolation in SAS by using a SAS/IML function. It is assumed that you have observed the values of a response variable on a regular grid of locations. A previous article showed how to interpolate inside one rectangular cell. When you have a

Programming Tips
Rick Wicklin 0
What is bilinear interpolation?

I've previously written about linear interpolation in one dimension. Bilinear interpolation is a method for two-dimensional interpolation on a rectangle. If the value of a function is known at the four corners of a rectangle, an interpolation scheme gives you a way to estimate the function at any point in

Advanced Analytics | Analytics | Artificial Intelligence | Customer Intelligence | Machine Learning
Antonio Calvo 0
Has social distancing affected retail personalisation?

Few of us expected to experience problems with retailers during the lockdown. Most people have, after all, been happily buying online for years. Why would anything change just because some physical shops closed for a while, or some people could not go out? However, the challenges went a bit deeper

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