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This was going to be my question. "Didn't statisticians abandon this for R like 25 years ago?"

Yes they did to my regrets. I did admit whilst xlisp-stat is much cleaner implementation for stat. and is my entry to Common Lisp (via simulation of social scientist 1st edition). But lisp is in the way, sort of, for many.

It is nice to have a common lisp version to use in statistical area, for those who does not hinder by it.

There is some migration aid for this, as it is really common lisp based statistical package like xlisp.

https://lisp-stat.dev/docs/resources/xlisp/

Ah I did get confused. I have Luke's book from 1990 still!