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There are many R functions out there but only some of them have a standard formula interface (see e.g. this question: Formula interface for glmnet). I think in general formula interfaces are a good way to standardize R functions and provide a consistent user experience.

My question
Is there an authoritative reference how to build a formula interface for a given R function and/or can you give an overview of the steps to do this? I hope that you don't have to program everything from scratch... Thank you

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vonjd
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    this is possibly too broad/off topic (looking for off-site resource) for SO, although I do think it's interesting. https://developer.r-project.org/model-fitting-functions.html might be a good place to start – Ben Bolker Jun 06 '16 at 16:24
  • @BenBolker: Why should this be too broad? You yourself just gave a very good reference... Thank you! – vonjd Jun 06 '16 at 16:35

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