Minimizing a Median

\( \def\xorder#1{x_{\left(#1\right)}} \def\xset{\mathbb{X}} \def\xvec{\mathbf{x}} \)A somewhat odd (to me) question was asked on a forum recently. Assume that you have continuous variables \(x_{1},\dots,x_{N}\) that are subject to some constraints. For simplicity, I’ll just write \(\xvec=(x_{1},\dots,x_{N})\in\xset\). I’m going to assume that \(\xset\) is compact, and so in particular the \(x_{i}\) are bounded. The questioner wanted to …

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Public data and digital research ethics

The Verge recently posted an article that highlights some of the ethical dilemmas involved in collecting publicly-available data for research purposes. The article begins by describing the work of a researcher working on facial recognition of people before and after hormone replacement therapy: On YouTube, he found a treasure trove. Individuals undergoing HRT often document their progress …

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Varieties of Snowflakes

I was pleasantly surprised that New Yorker editor David Remnick and Berkeley law professor Melissa Murray continue to support the First Amendment, even if some of her students do not. Remnick gives Historian Mark Bray (author of Antifa: The Anti-Fascist Handbook) a tough time about the role of violence in political movements. After Charlottesville, the Limits …

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How to be an effective acting director, chair or dean — Part II (essay)

Last week, Inside Higher Ed published an essay of mine describing my experience as an interim dean. It covered several practical, task-oriented topics: identifying one’s core mission for the interim period, allaying colleagues’ fears, acquiring reliable information and triaging the issues that land in your inbox. But leading a college that includes a department of theater helped me recognize …

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Using MPlus from R with MPlusAutomation

According to the MPlus website, the R package MPlusAutomation serves three purposes: Creating related groups of models Running batches Extracting and tabulating model parameters and test statistics. Because modeling involves comparing related models, (partially) automating these is compelling. It can make it easier to use model results in subsequent analyses and can cut down on copy and pasting …

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