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Remove lme4 #266

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Remove lme4 #266

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@kenkellner kenkellner commented Dec 11, 2023 •
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We currently use lme4 to handle bar expressions in formulas (via findbars and nobars) and to create the Z random effects matrix (via mkReTrms). This pull request re-writes this functionality from scratch (to better match what we use it for) and thus removes the lme4 dependency.

@kenkellner kenkellner linked an issue Dec 11, 2023 that may be closed by this pull request
Copy lme4 code into package, instead of importing it #253
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I think I probably will not merge this because it looks like the reformulas package will be on CRAN soon, which would provide the formula processing tools without the weight of the rest of lme4.

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Copy lme4 code into package, instead of importing it
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