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Crime Analysis

Milepost GIS Location Estimation in R
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 …
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Comparison of R and Python Parallel Computing in Address Geocoding
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 …
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R Function to Calculate Bearing Between Two Positions (lat-lon)
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 …
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Build your own discrete event simulation framework in Python Part III
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 …
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Build your own discrete event simulation framework in Python Part II
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 …
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Build your own discrete event simulation framework in Python Part I
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. …
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Excel to R Transhipment Problem Optimization Tutorial Part II
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 …
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Excel to R Transhipment Problem Optimization Tutorial Part I
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 …
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Crime Analysis Series: Manhattan Distance in R
1 year ago

Crime Analysis Series: Manhattan Distance in R

By  •  Crime Analysis

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 …
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Crime Analysis Series Calculating Great Circle Distance Between Two Points in R Using Haversine Formula
1 year ago

Crime Analysis Series Calculating Great Circle Distance Between Two Points in R Using Haversine Formula

By  •  Crime Analysis

I recently started working in crime analysis and started to need to use latitudes and longitudes and calculate the distances between them. For this calculation I used the Haversine formula …
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