Monthly Archives: November 2010

New ebook: Asian Option Pricing with R/Rmetrics

November 10, 2010
By

(This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers) To leave a comment for the author, please follow the link and comment on his blog: Rmetrics blogs. R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web...

Read more »

Tell Forbes how you use R

November 10, 2010
By

Steve McNally of the Forbes Mean Business blog says R is a name you need to know for 2011. He cites some great examples of R in action: Facebook has used R to figure out that “just two data points are significantly predictive of whether a user remains on Facebook: (i) having more than one session as a new...

Read more »

Bayesian estimation with Markov Chain Monte Carlo using PyMC

November 10, 2010
By

Prof. Chris Fonnesbeck briefly introduces Bayesian inference, then discusses how to estimate Bayesian models with Markov Chain Monte Carlo using PyMC.PyMC is the premier Python package for doing MCMC estimation, and Prof. Fonnesbeck is one of the pac...

Read more »

Quantitative Ecology 2010-11-10 14:56:00

November 10, 2010
By

At last... I have been suffering with XEmacs displaying odd characters instead of the quotation marks that are used in R help files. This was driving me up the wall because it makes the files (and R output in general) very hard to read; however, I fina...

Read more »

Quantitative Ecology 2010-11-10 14:56:00

November 10, 2010
By

At last... I have been suffering with XEmacs displaying odd characters instead of the quotation marks that are used in R help files. This was driving me up the wall because it makes the files (and R output in general) very hard to read; however, I fina...

Read more »

Co-authorship Network of SSRN Conflict Studies eJournal

November 10, 2010
By

As part of my on-going research simulating network structure using graph motifs I have been collecting novel data sets to test and benchmark the method. Since I am a political scientist studying conflict, it was suggested to me to collect a co-authorship network within this sub-discipline. Such a network is useful for several reasons;

Read more »

Generating a quasi Poisson distribution, version 2

November 10, 2010
By
Generating a quasi Poisson distribution, version 2

Here and there, I mentioned two codes to generated quasiPoisson random variables. And in both of them, the negative binomial approximation seems to be wrong. Recall that the negative binomial distribution iswhere and in R, a negative binomial di...

Read more »

Don’t be a Turkey

November 9, 2010
By
Don’t be a Turkey

'Indeed, I am moving on: my new project is about methods on how to domesticate the unknown, exploit randomness, figure out how to live in a world we don't understand very well. While most human thought (particularly since the enlightenment) has focused us on how to turn knowledge into decisions, my new mission is to...

Read more »

Don’t be a Turkey

November 9, 2010
By
Don’t be a Turkey

'Indeed, I am moving on: my new project is about methods on how to domesticate the unknown, exploit randomness, figure out how to live in a world we don't understand very well. While most human thought (particularly since the enlightenment) has focused us on how to turn knowledge into decisions, my new mission is to...

Read more »

Forecast estimation, evaluation and transformation

November 9, 2010
By
Forecast estimation, evaluation and transformation

I’ve had a few emails lately about forecast evaluation and estimation criteria. Here is one I received today, along with some comments. I have a rather simple question regarding the use of MSE as opposed to MAD and MAPE. If the parameters of a time series model are estimated by minimizing MSE, why do we

Read more »