This web page converts Wilkinson-Rogers notation
(used by e.g. MATLAB and R for linear models)
to a mathematical formula that can be used to calculate the interpolation in other languages, such as julia, C++ and MATLAB (for verification).
In MATLAB and R one can use for example respectively
lm to create a linear regression model.
Plaese notice that the order of the coefficients given by MATLAB and R differs from the order here (sorted alphabetically).
|+||+x1||include this variable|
|-||-x1||delete this variable|
|:||x : z||include the interaction between these variables|
|*||x * z||include these variables and all interactions between them|
|^||x^3||include interactions up to three way|
|1||- 1||the intercept (by default it is added)|