Below are all of my presentations, as well as upcoming presentations, including slides and video when available.
Point process modeling with spatiotemporal covariates for predicting crime.
JSM 2016, Chicago, IL, August 3, 2016.
Extensive research has shown that crime tends to be concentrated in hotspots: small pockets with above-average rates of crime. Criminologists and law enforcement agencies want to better predict crime hotspots and understand the factors that cause them, in order to target interventions. Prior research suggests that past crime hotspots, spatial features (like bus stops or bars), and leading indicators (like 911 calls) are all predictive of future crime, but no proposed predictive policing model can account for all of these factors. We have adapted a previous self-exciting point process model to incorporate past crime data, leading indicators, spatial features and spatial covariates (like population density or zoning data), and developed new tools to evaluate the performance of the model and select variables. We show the basic model and demonstrate its application to seven years of Pittsburgh crime data, comparing its fits to previous hotspot models. These results can be used to better guide crime prevention programs and police patrols.
Statistics Done Wrong: Pitfalls in Experimentation.
LASER Workshop, Washington, DC, October 16, 2014. Video.
Most research relies on statistical hypothesis testing to report its conclusions, but the seeming precision of statistical significance actually hides many possible biases and errors. The prevalence of these errors suggests that most published results are exaggerated or false. I will explain some of these errors, such as inadequate sample sizes, multiple comparisons, and the keep-looking bias, and their impact on published results. Finally, I will suggest solutions to these problems, including statistical improvements and changes to scientific funding and publication practices.