e] The use of .it[regression] differs from our use of .it[linear regression].

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## Translating terms

`\(\color{#6A5ACD}{\mathbf{X}}\)` (treatment variable/covariates, independent variables, regressors)
- Now: **predictors, features.**

`\(\hat{\color{#FFA500}{\mathbf{Y}}}\)` (outcome variable, dependent variable)
- Now: **target, label.**

"Estimate a model" or "fit a model"
- Now: **Train** a model, **learn** a model.


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## General framework

A .turquoise[function] `\(\color{#20B2AA}{f}\)` takes .pu