R, Julia and the shiny new thing

April 12, 2012 | Luis

My head exploded a while ago. Perhaps not my head but my brain was all mushy after working every day of March and first week of April; an explanation—as good as any—for the post hiatus. Back to the post title. … Continue reading → [Read more...]

Early-March flotsam

March 8, 2012 | Luis

It has been a strange last ten days since we unexpectedly entered grant writing mode. I was looking forward to work on this issue near the end of the year but a likely change on funding agency priorities requires applying … Continue reading → [Read more...]

Mid-February flotsam

February 17, 2012 | Luis

This coming Monday we start the first semester in Canterbury (and in New Zealand for that matter). We are all looking forward to an earthquake-free year; more realistically, I’d be happy with low magnitude aftershocks. The Wall Street Journal reports … Continue reading → [Read more...]

If you have to use circles…

February 15, 2012 | Luis

Stats Chat is an interesting kiwi site—managed by the Department of Statistics of the University of Auckland—that centers around the use and presentation of statistics in the media. This week there was an interesting discussion on one of those infographics … Continue reading → [Read more...]

Revisiting homicide rates

February 10, 2012 | Luis

A pint of R plotted an interesting dataset: intentional homicides in South America. I thought the graphs were pretty but I was unhappy about the way information was conveyed in the plots; relative risk should be very important but number … Continue reading → [Read more...]

Oracle’s strange understanding of R users

February 8, 2012 | Luis

After reading David Smith’s tweet on the price of Oracle R Enterprise (actually free, but it requires Oracle Data Mining at $23K/core as pointed out by Joshua Ulrich.) I went to Oracle’s site to see what was all about. Oracle … Continue reading → [Read more...]

Early-February flotsam

February 7, 2012 | Luis

Mike Croucher at Walking Randomly points out an interesting difference in operator precedence for several mathematical packages to evaluate a simple operation 2^3^4. It is pretty much a divide between Matlab and Excel (does the later qualify as mathematical software?) … Continue reading →
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Rstudio and asreml working together in a mac

February 5, 2012 | Luis

December and January were crazy months, with a lot of travel and suddenly I found myself in February working in four parallel projects involving quantitative genetics data analyses. (I’ll write about some of them very soon) Anyhow, as I have … Continue reading → [Read more...]

Mid-January flotsam: teaching edition

January 17, 2012 | Luis

I was thinking about new material that I will use for teaching this coming semester (starting the third week of February) and suddenly compiled the following list of links: William Briggs writes It is time to stop teaching Frequentism to … Continue reading → [Read more...]

R is a language

January 11, 2012 | Luis

A commenter on this blog reminded me of one of the frustrating aspects faced by newbies, not only to R but to any other programming environment (I am thinking of typical students doing stats for the first time). The statement … Continue reading → [Read more...]

Doing Bayesian Data Analysis now in JAGS

January 3, 2012 | Luis

Around Christmas time I presented my first impressions of Kruschke’s Doing Bayesian Data Analysis. This is a very nice book but one of its drawbacks was that part of the code used BUGS, which left mac users like me stuck. … Continue reading → [Read more...]

Plotting earthquake data

January 2, 2012 | Luis

Since 4th September 2010 we have had over 2,800 quakes (considering only magnitude 3+) in Christchurch. Quakes come in swarms, with one or few strong shocks, followed by numerous smaller ones and then the ocasional shock, creating an interesting data … Continue reading → [Read more...]

An R wish list for 2012

December 26, 2011 | Luis

I expect there will be many reviews and wish lists for R this year, with many of them focusing on either running speed or dealing with large data sets. However, most issues that I would like to see tackled in … Continue reading → [Read more...]

R pitfall #3: friggin’ factors

December 15, 2011 | Luis

I received an email from one of my students expressing deep frustation with a seemingly simple problem. He had a factor containing names of potato lines and wanted to set some levels to NA. Using simple letters as example names … Continue reading → [Read more...]

Tall big data, wide big data

December 12, 2011 | Luis

After attending two one-day workshops last week I spent most days paying attention to (well, at least listening to) presentations in this biostatistics conference. Most presenters were R users—although Genstat, Matlab and SAS fans were also present and not one … Continue reading → [Read more...]

R, academia and the democratization of statistics

December 12, 2011 | Luis

I am not a statistician but I use statistics, teach some statistics and write about applications of statistics in biological problems. Last week I was in this biostatistics conference, talking with a Ph.D. student who was surprised about this situation … Continue reading → [Read more...]

On the (statistical) road, workshops and R

December 3, 2011 | Luis

Things have been a bit quiet at Quantum Forest during the last ten days. Last Monday (Sunday for most readers) I flew to Australia to attend a couple of one-day workshops; one on spatial analysis (in Sydney) and another one … Continue reading → [Read more...]

If you are writing a book on Bayesian statistics

November 23, 2011 | Luis

This post is somewhat marginal to R in that there are several statistical systems that could be used to tackle the problem. Bayesian statistics is one of those topics that I would like to understand better, much better, in fact. … Continue reading → [Read more...]

Do we need to deal with ‘big data’ in R?

November 22, 2011 | Luis

David Smith at the Revolutions blog posted a nice presentation on “big data” (oh, how I dislike that term). It is a nice piece of work and the Revolution guys manage to process a large amount of records, starting with … Continue reading → [Read more...]
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