Do basic R operations much faster in bash [Slightly off-topic]
R is great, and you can do a LOT OF stuff with it.However, sometimes you want to do really basic stuff with huge or a lot of files. At work,...continue reading.
Category: R
Population Model Revisited
In a previous post I showed an animated age structure diagram depicting output from a simple population model written in Excel. Here is another version of that model written in...continue reading.
Automating R exercises and exams using the exams package
It’s a pain to design statistics exercises each semester, and because students from previous share old exercises with the new incoming students, it’s hard to design simple exercises that students...continue reading.
First step on GIS with R
The PM 2.5 checker written by R has been working nicely for me. I put a shortcut icon of this small script on my desktop PC, to check the air...continue reading.
Calculate the odd of winning Powerball in R
This Wednesday’s Powerball grand prize already climbed up to $1.5 BILLION. If you choose to cash out, it would be $930 million. And it keeps increasing… So, what’s the odd...continue reading.
High Flows in Lower Columbia River near Portland, OR
After I completed the animated tidal water surface elevation plots for the Delaware Estuary, I looked for other systems with a good set of tidal observation stations. The Lower Columbia...continue reading.
Animated 3D Plot of Ammonia Toxics Criteria
In 2013, EPA published final national recommended water quality criteria for the protection of aquatic life from the toxic effects of ammonia in freshwater.http://www.epa.gov/wqc/aquatic-life-criteria-ammoniaThese criteria are a function of water …continue reading.
My MSc thesis: A meta-analysis of relative clause processing in Mandarin Chinese using bias modelling
Here is my MSc thesis, which was submitted to the University of Sheffield in September 2015. The pdf is here.Title: A Meta-analysis of Relative Clause Processing in Mandarin Chinese using Bias...continue reading.
Stop fiddling around with copied paths in Windows R
I work with R on both Mac OS and Windows. On Windows, you get the option to copy the path of a file or folder by holding Shift while right-clicking...continue reading.
Time series analysis with R: Testing stuff with NetAtmo data
I’ve got a NetAtmo weather station. One can download the measurements from its web interface as a CSV file. I wanted to give time series analysis with the extraction of...continue reading.
Speeding up the Cluster Bootstrap in R
Back in January 2013 I wrote a blog post showing how to implement a basic cluster/block bootstrap in R. One drawback of the cluster bootstap is the length of time...continue reading.
Shiny 1: Amazon AWS for R and Shiny
Learn how to set up an Amazon AWS Ubuntu instance on which you can install R , RStudio, OpenCPU, or Shiny Server. The post Shiny 1: Amazon AWS for R...continue reading.
Estimating Quasi-Poisson Regression with GLIMMIX in SAS
When modeling the frequency measure in the operational risk with regressions, most modelers often prefer Poisson or Negative Binomial regressions as best practices in the industry. However, as an alternative...continue reading.
Some Considerations of Modeling Severity in Operational Losses
In the Loss Distributional Approach (LDA) for Operational Risk models, multiple distributions, including Log Normal, Gamma, Burr, Pareto, and so on, can be considered candidates for the distribution of severity...continue reading.
The Keep Function
Reading Time: 2 minutes Occasionally when I am jotting some code I find myself creating several temporary variables with the intention of later getting rid of them. These variables involve...continue reading.
The Keep Function
Reading Time: 2 minutes Occasionally when I am jotting some code I find myself creating several temporary variables with the intention of later getting rid of them. These variables involve...continue reading.
Why I use Panel/Multilevel Methods
I don’t understand why any researcher would choose not to use panel/multilevel methods on panel/hierarchical data. Let’s take the following linear regression as an example: , where is a random...continue reading.
Hot news detection using Wikipedia
Wikipedia is, indeed, one of the largest free access crowdsourcing [1] sources of information in today’s world. Every day, thousands of people land on its pages to get information about...continue reading.
Stop and Frisk: Spatial Analysis of Racial Differences
In my last post, I compiled and cleaned publicly available data on over 4.5 million stops over the past 11 years. I also presented preliminary summary statistics showing that blacks had...continue reading.
Cluster analysis on earthquake data from USGS
Theoretical BackgroundIn some cases we would like to classify the events we have in our dataset based on their spatial location or on some other data. As an example we...continue reading.
