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# Crime Analysis

8 months ago

## Milepost GIS Location Estimation in R

I was recently forced at gunpoint to estimate the positions of mileposts along the highways in Maricopa County. This was to estimate stops and arrest positions for law enforcement. Like …

8 months ago

## Comparison of R and Python Parallel Computing in Address Geocoding

I recently needed to process a bunch of addresses that our proprietary geocoding software was having a problem with. I won’t say the name of the geocoder, but it rhymes …

8 months ago

## R Function to Calculate Bearing Between Two Positions (lat-lon)

An R function I had to write to calculate the true course/bearing between two lat lon positions. Note that the fossil R library has a function called earth.bear to do …

11 months ago

## Build your own discrete event simulation framework in Python Part III

In Part II, we added a queue and a PatrolCar class to our Python simulation to answer call events in our police patrol simulation. In this installment, we’ll add calls to …

11 months ago

## Build your own discrete event simulation framework in Python Part II

In Part I, we learned about creating a simple discrete event simulation controller in Python, using a clock that iterated over a minute counter and translated this minute counter to …

11 months ago

## Build your own discrete event simulation framework in Python Part I

The first question you might ask, is why the heck would you build your own simulation framework in Python? There’s a million of them, right?

I wouldn’t say a million. …

11 months ago

## Excel to R Transhipment Problem Optimization Tutorial Part II

In this tutorial, I’ll finish the process of converting a simple Excel Transshipment problem that I wrote to minimize the traveling distance that a set of patrol cars would have …

12 months ago

## Excel to R Transhipment Problem Optimization Tutorial Part I

In this tutorial I’m going to go through creating an optimization model in Excel. The next part of the tutorial will be scaling a small optimization program into a larger …

1 year ago

## Crime Analysis Series: Manhattan Distance in R

As you can see in the image embedded in this page, travel from downtown Phoenix to downtown Scottsdale involves several rectangular-like movements. Traveling in a city laid out in a …