Часто в примерах кода встречаю, а что это и откуда найти не могу.
- [formula {stats}](https://stat.ethz.ch/R-manual/R-devel/library/stats/html/formula.html). The generic function formula and its specific methods provide a way of extracting formulae which have been included in other objects. - [Asterisk (*) vs. colon (:) in R formulas {closed}](https://stackoverflow.com/questions/40567421/asterisk-vs-colon-in-r-formulas) - COOL! [Formulae in R - ANOVA and other models, mixed and fixed](https://conjugateprior.org/2013/01/formulae-in-r-anova/) - [The R Formula Method: The Good Parts](https://rviews.rstudio.com/2017/02/01/the-r-formula-method-the-good-parts/). 2017-02-01 by Max Kuhn - [The R Formula Method: The Bad Parts](https://rviews.rstudio.com/2017/03/01/the-r-formula-method-the-bad-parts/). 2017-03-01 by Max Kuhn https://statisticaloddsandends.wordpress.com/2019/08/24/changing-the-variable-inside-an-r-formula/
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