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Unifying packages to help users access R repositories

September 3, 2017
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Unifying packages to help users access R repositories

With over 11,000 packages in the main CRAN (Consolidated R Archive Network) collection, users of R face a challenge when looking for tools to carry out their statistical and computational tasks, especially in subject areas outside their main domain of expertise. Moreover, a lot of packages have similar or overlapping features. Some are, to be…

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Choosing which method to use for “optimizing” functions

November 20, 2016
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Choosing which method to use for “optimizing” functions

A decision tree for function minimization What R calls “optimization” is more generally known as function minimization. The tools in the stats package function optim() are all essentially function mimizers, as are those in the package optimrx found at https://r-forge.r-project.org/projects/optimizer/. optimrx tries to make it easier for users to call quite a few methods without having to learn many different sets of command…

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Why optim() is out of date

November 10, 2016
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Why optim() is out of date

Why optim() is out of date And perhaps you should be careful using it Once upon a time Once upon a time, there was a young Oxford D.Phil. graduate with a thesis on quantum mechanics who — by virtue of a mixup in identities — got hired as an Agricultural Economist. He was actually better…

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