You've probably heard of the Birthday Paradox: it only takes a small gathering of people before it's quite likely that two of them share the same birthday. You can solve the problem analytically or with simulation, but usually in either case simplifying assumptions are made (no-one born on February 29, for example). Joe Rickert uses Revolution R Enterprise 6...
Monthly Archives: June 2012
Body Weight in the United States – Part 1, "The Problem"
The Problem
In the United States, people are getting fatter and they are doing so at an alarming rate.
So What?
Being fat isn't just a social stigma - it's unhealthy in nearly every facet of life. Staying in this condition brings high blood pressure, diabetes, asthma and arthritis to name...
Claims reserving and IBNR with R
Following previous posts on life contingencies and longevity and mortality models, I upload additional material for the short course at the 6th R/Rmetrics Meielisalp Workshop & Summer School on Computational Finance and Financial Engineeri...
Let’s Party!
Exploring whether regression coefficients differ between groups is an important part of applied econometric research, and particularly for research with a policy based objective. For example, a government in a developing country may decide to introduce free school lunches in an effort to improve childhood health. However, if this treatment is known to only improve 
Project Euler — problem 7
Prime is the core of number theory. Here is an introduction of prime number on Wikipedia. I could only understand roughly half of it. Now, let’s look at the seventh problem of Project Euler, which is another about prime number. By listing the first six prime numbers: 2, 3, … Continue reading →
2 min HOWTO in R
Lots of short videos on how to do several things in R.
Facts About R Packages (2)
R Packages All Well maintained?
There are so many R packages, can they all be trusted? or are they well maintained? To answer this question, we just need to take a look of their archive histories. If a package has many versions, we can take that as the authors spent a lot of time to make their packages perfect, these...
R-NOLD 2012-06-06 03:18:00
While traveling across the Visayas, I encountered barangay (villages) with the name same as my last name. Using R and map data from gadm.org I search and mapped other villages in the country named “Salvacion”.
Facts About R Packages (1)
R Packages growth Curve
Why R is so popular? There are a lot of reasons, such as: easy to learn and convenient to use, active community, open source, etc. Another important reason is the numerous contributed packages. Up to yesterday, there are 3854 R packages on CRAN.
The following figure shows the growth curve of R package:
Managing the deluge of DNA data
The explosion in DNA sequencing capacity has shifted the experimental bottleneck from sequencing to analyzing and interpreting sequences. The bioconductor package cummeRbund uses ggplot as part of its tool set for organizing, exploring and visualizing ...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
