The SEC’s fails-to-deliver data, per the SEC website, represents the “aggregate net balance of [equity] shares that failed to be delivered as of a particular settlement date.” Further, the SEC website clarifies what these values represent: The figure is not a daily amount of fails, but a combined figure that includes both new fails on the reporting day as well as existing fails. In other words, these numbers reflect aggregate fails as of a specific point in time, and may have little or no relationship to yesterday’s aggregate fails.

RStudio, an IDE for R, has made tons of improvements over the past 5 years and one of them is the ability to run non-R code (including the output from said non-R code) inline, within an RMarkdown document. In light of this functionality, today’s post will run through an example of how to run JavaScript - specifically, d3.js, a JS library for “manipulating documents based on data” - within RStudio using the library r2d3.

Multilevel data is data that includes repeated measures of the same subject or variables over some period of time e.g: A five-year study on the test scores of students grouped by cohorts and classes across a state’s K-12 schools Patient satisfaction of care grouped by attending doctors and their respective practices Police use of force incidents by race of suspect grouped by precinct, patrol, and arresting officer Analysts can encounter data of this type in just about any conceivable industry that produces data and the grouping structure must be fully understood to properly explore, model, and simulate before creating any usable insight.

At this point it’s pretty well-established that the pandemic has had a tremendous impact on human life around the world and particularly within New York City’s five boroughs. At the time of this post, over 10% of the USA’s 209K+ deaths have come from NYC alone (23,852). The death-toll from the pandemic is staggering on its own - and continues to shock in its reach - but the addition of the shutdown (and continued restrictions - even in Phase 4 of the reopening) has had a compounding effect on all aspects of socioeconomic activity in the city.