I finally got around to reading Ralph Vince’s latest The Leverage Space Trading Model (for a brief summary see this magazine article in Futures), and I’m happy to say that the book was very helpful in approach and example. I especially enjoye...

Yesterday I tried to insert some more R code into knime. scatterplot smoothed density library("geneplotter") ## from BioConductor require("RColorBrewer") ## from CRAN x1 <- matrix(rnorm(1e4), ncol=2) x2 <- matrix(rnorm(1e4, mean=3, sd=1.5...

So today I’m going to follow another R-course which is supposed to tell me more about Flowcytometry in R. I’ll keep you up to date

The version 0.22 of solaR includes a new method, mergesolaR. It is designed to merge daily time series of several solaR objects. For example, we can obtain the daily irradiation of the whole set of meteorological stations of Madrid (Spain) and use this information to calculate the productivity of a grid connected PV system. It

Recently I wrote a couple of small functions as a result of work done by myself and others in my lab group. The first is a function that determines what sites in a sequence alignment are ambiguous (i.e. not A, G, C or T). require(ape)data(woodmouse)is.ambig x bases ambig ambig > 0}is.ambig(woodmouse)This function utilises the bit-level coding scheme that...

Recently I wrote a couple of small functions as a result of work done by myself and others in my lab group. The first is a function that determines what sites in a sequence alignment are ambiguous (i.e. not A, G, C or T). require(ape)data(woodmouse)is.ambig x bases ambig ambig > 0}is.ambig(woodmouse)This function utilises the bit-level coding scheme that...

If you're planning to attend the worldwide R user conference useR! 2011, don't forget that April 1 (this Friday) is the deadline for submitting abstracts for contributed talks and posters. Early-bird discounts for attendee registrations expire on Friday as well. (Revolution Analytics is a proud sponsor of useR! 2011, and chief scientist Lee Edlefsen is one of the keynote...

(This post got published on The Statistics Forum yesterday.) The short book review section of the International Statistical Review sent me Raquel Prado’s and Mike West’s book, Time Series (Modeling, Computation, and Inference) to review. The current post is not about this specific book, but rather on why I am unsatisfied with the textbooks in

Over the last several days, I have had the “pleasure” of getting parallel processing with R running on the the Ohio Supercomputer Center’s (OSC) Glenn cluster. I am working on a project that uses GenMatch from Sekhon’s Matching, which uses … Continue reading →

Today I’m checking which plot function works fastest, I did this via this blogpost. http://www.r-bloggers.com/five-ways-to-visualize-your-pairwise-comparisons/ But I’m not doing this in an Rgui, but in Knime. I read in an example ACS file, ...

A recent post listed at R Bloggers (http://www.r-bloggers.com/r-guis-which-one-fits-you/) made some erroneous statements about R Commander. Here is a revised description of R Commander with some issues addressed from the earlier blog:R Commander works ...

A recent post listed at R Bloggers (http://www.r-bloggers.com/r-guis-which-one-fits-you/) made some erroneous statements about R Commander. Here is a revised description of R Commander with some issues addressed from the earlier blog:R Commander works ...

Overfitting is a problem when trying to predict financial returns. Perhaps you’ve heard that before. Some simple examples should clarify what overfitting is — and may surprise you. Polynomials Let’s suppose that the true expected return over a period of time is described by a polynomial. We can easily do this in R. The first … Continue reading...

Today Left Censored became a contributor to R-Bloggers. If you’ve never heard of it, R-Bloggers is a blog aggregator that brings together R-related posts from a large number of blogs across the Internet. It’s an excellent resource for those who … Continue reading →

I think I have found a superior solution to integrating Ultraedit and R. See my post over at IDM Users forum.

This morning, I noticed that none of my R related posts had appeared on R-bloggers for the past fortnight… After investigating, this was caused by…cut-and-paste! Indeed, when advertising about the special issue of TOMACS Arnaud Doucet and I edit about Monte Carlo methods in Statistics, I copied the main parts from the pdf announcement, straight

In recently years, high-throughput experimental techniques such as microarray and mass spectrometry can identify many lists of genes and gene products. The most widely used strategy for high-throughput data analysis is to identify different gene clusters based on their expression profiles. Another commonly used approach is to annotate these genes to biological knowledge, such as Gene Ontology (GO) and...

I’m currently writing some lecture notes on R and I used the phrase “a R package” without thinking. Since the word following the article “a” was a consonant, I automatically went for “a” instead of “an”. The problem is that “R” sounds likes a vowel, so “a R package” grates on the listener. The correct