Gun Violence Incident Grouping via PCA

Note (Oct. 14, 2016): Part of this work was used in a collaboration between the AP here and USA TODAY NETWORK here.

The Gun Violence Archive (GVA) has for each event a list of characteristics. There are 92 distinct tags that are used. Many of these tags are either redundant or unnecessarily specific for the kinds of questions I am interested in investigating:

  • What are the most frequent kinds of gun-related incidents?
  • Where are they located and which demographic groups are affected by them?


Mixed Procedures For Stochastic Optimization - WODES 2016

This is part of ongoing work with Professor Felisa Vázquez-Abad of Hunter College. This is the preliminary draft submitted for the WODES 2016 conference. The particularly tricky bit this time around was our decision to use a less trivial example scenario: instead of just a deterministic function plus a normally distributed noise term, we chose to construct a more complicated stochastic function. Crucially, since we wanted to speak to the usefulness of gradient estimation, we wanted a function where IPA derivative estimation could be used.


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