NYC Traffic Accidents Heatmap

A simple chart in one place. This figure was a nice-looking variant to a paper that was ultimately accepted in EEJ. This figure itself didn’t make it, but it is a really good-looking one. This is a heat map of all accidents in NYC, from July 2012 through March 2019. Black areas are few accidents, […]

Python and Zero-Inflated Models

While this is hardly a tutorial, I’ve been spending a good deal of time working with zero-inflated data for a forthcoming project, and have worked with it extensively in the past. The point of zero-inflated models is there are ultimately two sources of zeros, zeros can come from the primary model (usually Poisson), or they […]

Economics Jobs

As a department, we had a meeting about jobs in economics. I collected some information on the subject. Out of 31656 job postings, most summaries are duplicates- the positions may be different, but the first 30 words of the summary were the same.  Here are the results of 638 unique postings for “economics entry level” […]

Multiple Linear Regression in R

In the previous exercise: Why do we need N-2?, I show a simple 1 dimensional regression by hand, which is followed by an examination of sample standard errors.  Below I make more extensive use of R (and an additional package) to plot what linear regression looks like in multiple dimensions. This generates the images above, […]