Description Usage Arguments Value

The `emmeans::emmeans()`

function broke a golden rule: they
return a different class of data based on unrelated parameters. In this
case, if the `specs`

parameter is a one-sided formula it returns a
`emmGrid`

whereas if it's two-sided for a list, it returns a
`emm_list`

. This makes it quite hard to work with reliably. To address
this, this helper function cleans the inputs before handing them off to
`specs`

to make a one sided formula (like `~ x + y`

) into an
acceptable two-sided formula (like `pairwise ~ x + y`

), allowing
emmeans to be used and always producing a single class of output.

1 | ```
clean_emmeans_specs(specs)
``` |

`specs` |
the specs input to process |

a two-sided formula with the LHS being 'pairwise' if the input is a formula, otherwise return original input

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