align `null_model()` with other model types

tidymodels / parsnip

A tidy unified interface to models

https://parsnip.tidymodels.org

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align `null_model()` with other model types #1085

Closed simonpcouch closed 2 months ago

simonpcouch commented 3 months ago

Closes #1083. :)

Adds an argument engine to null_model() with default "parsnip"
Checks inputs with new_model_spec()
Tests that result can be fitted without calling set_engine()
Uses documentation format for mode and engine that follows the same patterns for other model types

Related to #1009 but does not close: still some documentation work to do in another PR.

github-actions[bot] commented 2 months ago

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