R examples of contrast coding

[smasongarrison]

https://stats.oarc.ucla.edu/r/library/r-library-contrast-coding-systems-for-categorical-variables/

[smasongarrison]

https://marissabarlaz.github.io/portfolio/contrastcoding/

[Xuanyu-Lyu]

Hi Mason, Thanks for those resources. Yeah they are the traditional contrasts coding scheme in R. There are two problems for them: 1. Not very user-friendly to read or assign the coefficients. 2. When we want to decompose the interaction of two or more factors, the traditional contrasts coding has some bugs with the symbol ":", which is a symbol to indicate interaction effects in base R.
Hence in our package, we may want to address the two problems.

Here's a package I found that made the coefficients assignment more friendly. But still didn't dip too much into the interaction thing...
https://cran.r-project.org/web/packages/multcomp/multcomp.pdf