Posts Tagged ‘ R ’

Reading the Gauss-Markov theorem

August 26, 2014
By
Reading the Gauss-Markov theorem

What is the Gauss-Markov theorem? From “The Cambridge Dictionary of Statistics” B. S. Everitt, 2nd Edition: A theorem that proves that if the error terms in a multiple regression have the same variance and are uncorrelated, then the estimators of the parameters in the model produced by least squares estimation are better (in the sense […] Related posts: What is meant by regression modeling? Skimming statistics papers for the ideas…

Read more »

ChainLadder 0.1.8 released

August 26, 2014
By
ChainLadder 0.1.8 released

Over the weekend we released version 0.1.8 of the ChainLadder package for claims reserving on CRAN. What is claims reserving?The insurance industry, unlike other industries, does not sell products as such but promises. An insurance policy is a promise ...

Read more »

The Chi-Squared Test of Independence – An Example in Both R and SAS

The Chi-Squared Test of Independence – An Example in Both R and SAS

Introduction The chi-squared test of independence is one of the most basic and common hypothesis tests in the statistical analysis of categorical data.  Given 2 categorical random variables, and , the chi-squared test of independence determines whether or not there exists a statistical dependence between them.  Formally, it is a hypothesis test with the following null and […]

Read more »

Forecasting with R in WA

August 24, 2014
By
Forecasting with R in WA

On 23–25 September, I will be running a 3-day workshop in Perth on “Forecasting: principles and practice” mostly based on my book of the same name. Workshop participants will be assumed to be familiar with basic statistical tools such as multiple...

Read more »

Do your "data janitor work" like a boss with dplyr

August 20, 2014
By
Do your "data janitor work" like a boss with dplyr

Data “janitor-work”The New York Times recently ran a piece on wrangling and cleaning data:“For Big-Data Scientists, ‘Janitor Work’ Is Key Hurdle to Insights”Whether you call it “janitor-work,” wrangling/munging, cleaning/cleansing/scru...

Read more »

Recent Articles

August 20, 2014
By
Recent Articles

  I have uploaded a few papers I have written and presented at some national conferences over the past several years.  Currently, all the articles relate to election research.

Read more »

Hijacking R Functions: Changing Default Arguments

August 19, 2014
By
Hijacking R Functions: Changing Default Arguments

I am working on a package to collect common regular expressions into a canned collection that users can easily use without having to know regexes. The package, qdapRegex, has a bunch of functions in the form of rm_xxx. The only … Continue reading →

Read more »

googleVis 0.5.5 released

August 19, 2014
By
googleVis 0.5.5 released

Earlier this week we released googleVis 0.5.5 on CRAN. The package provides an interface between R and Google Charts, allowing you to create interactive web charts from R. This is mainly a maintenance release, updating documentation and minor issues.Sc...

Read more »

GEFCom 2014 energy forecasting competition is underway

August 18, 2014
By
GEFCom 2014 energy forecasting competition is underway

GEFCom 2014 is the most advanced energy forecasting competition ever organized, both in terms of the data involved, and in terms of the way the forecasts will be evaluated. So everyone interested in energy forecasting should head over to the competitio...

Read more »

STEM forums

August 15, 2014
By
STEM forums

“I can calculate the movement of stars, but not the madness of men.” Isaac Newton When visiting the exhibition hall at JSM 2014, I spoke with people from STEM forums on the Springer booth. The concept of STEM (why STEM? Nothing to do with STAN! Nor directly with Biology. It stands as the accronym for Science, Technology, […]

Read more »


Subscribe

Email:

  Subscribe