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Drop unused factor levels in categorical variables #23

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aalfons opened this issue Nov 22, 2021 · 1 comment
Open

Drop unused factor levels in categorical variables #23

aalfons opened this issue Nov 22, 2021 · 1 comment
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aalfons commented Nov 22, 2021

Unused factor levels in categorical (independent or control) variables should be dropped. Argument drop.unused.levels in function model.frame() controls this and should be set to TRUE.
@aalfons aalfons self-assigned this Nov 22, 2021
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aalfons commented Nov 22, 2021

Likely this needs to be fixed in the default method of fit_mediation(), where non-numeric x variables and covariates are converted using model.matrix().

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