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.
R News from another blog for R community
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.
ggtern 2.0 now available
Recently ggplot2 received a severe makeover by releasing version 2.0, and in the spirit of improvement, I thought ggtern should also get an overhaul, so after a few-hundred hours of...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.
RcppParallel: Getting R and C++ to work (some more) in parallel
(Post by Dirk Eddelbuettel and JJ Allaire) A common theme over the last few decades was that we could afford to simply sit back and let computer (hardware) engineers take...continue reading.
Getting Started with Data Science: Storytelling with Data
Earlier this month, IBM Press and Pearson have published my book titled: Getting Started with Data Science: Making Sense of Data with Analytics. You can download sample pages, including a...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.
Health Care Indicators in Utah Counties
The state of Utah (my adopted home) has an Open Data Catalog with lots of interesting data sets, including a collection of health care indicators from 2014 for the 29...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.
purrr 0.2.0
I’m pleased to announce purrr 0.2.0. Purrr fills in the missing pieces in R’s functional programming tools, and is designed to make your pure (and now) type-stable functions purrr. I’m...continue reading.
This Is the Place, Apparently
My family and I moved to Utah about 5 years ago and we have found ourselves thoroughly in love in with our new home state. I didn’t know much about...continue reading.
Where Bagging Might Work Better Than Boosting
In the previous post (https://statcompute.wordpress.com/2016/01/01/the-power-of-decision-stumps), it was shown that the boosting algorithm performs extremely well even with a simple 1-level stump as the base learner and provides a better performance...continue reading.
The Power of Decision Stumps
A decision stump is the weak classification model with the simple tree structure consisting of one split, which can also be considered a one-level decision tree. Due to its simplicity,...continue reading.
Parallelize Map()
Map() is a convenient routine in Python to apply a function to all items from one or more lists, as shown below. This specific nature also makes map() a perfect...continue reading.
Wind Resource Assessment
This is an article we recently published on “Renewable and Sustainable Energy Reviews”. It starts with a thorough review of the methods used for wind resource assessment: from algorithms based...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.
Joy to the World, and also Anticipation, Disgust, Surprise…
In my previous blog post, I analyzed my Twitter archive and explored some aspects of my tweeting behavior. When do I tweet, how much do retweet people, do I use...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.
