Blog Archives

…start using R, from scratch!

November 14, 2013
By
…start using R, from scratch!

Some time ago, since I was able to use R by myself, have found some fellows and other people who wanted to learn R as well. Then I pointed them to help pages, to CRAN repositories… but in some cases … Sigue leyendo →

Read more »

Power and sample size calculator for mitochondrial DNA association studies (Shiny)

July 1, 2013
By
Power and sample size calculator for mitochondrial DNA association studies (Shiny)

The functions detailed inside the piece of code below (in a Gist) has been useful for me when I had to calculate many possible scenarios of statistical power and sample size. The formulae were taken from the article of Samuels … Sigue leyendo →

Read more »

An .EPS to .PDF converter (using LaTeX!)

June 30, 2013
By
An .EPS to .PDF converter (using LaTeX!)

I am about to go on a short holiday, so I was tidying the code lines I had scattered around before leaving… And I found this: a minimal EPS to PDF converter, which is barely a LaTeX template. It is … Sigue leyendo →

Read more »

Biostatisticians… beware of fuzzy researchers!

June 11, 2013
By
Biostatisticians… beware of fuzzy researchers!

In the last days I was thinking about about how researchers could collaborate efficiently with their experts in statistics. With the increasing complexity in science, interchanging information can be crucial to get the best results. But what happens when a … Sigue leyendo →

Read more »

Using gdata, for MS Windows users

May 18, 2013
By
Using gdata, for MS Windows users

I use both GNU-Linux and Windows systems on a regular basis… so I’m aware of the advantages (more for GNU-Linux in my case) and disadvantages of both. Recently I needed to analyse a database from a remote location, an Excel … Sigue leyendo →

Read more »

heatmaps with p-values (2)… coloured according to odds ratio

May 7, 2013
By
heatmaps with p-values (2)… coloured according to odds ratio

I like heatplots with p-values -or frequencies, or whatever-. Not very conclusive, but pretty anyway. And when talking about graphs, pretty will make our neurons to fire in more interesting ways: neurons like “pretty” graphs. Moreover, observing your data can … Sigue leyendo →

Read more »

… ridiculously photogenic factors (heatmap with p-values)

May 5, 2013
By
… ridiculously photogenic factors (heatmap with p-values)

Some months ago, I had to explore a vast amount of categorical variables before making some multivariate analyses. One good way to know your raw data, to make new hypotheses…etc, is to calculate some pairwise “crude” chi-square tests of independence … Sigue leyendo →

Read more »

…learning LaTeX, from scratch!

May 2, 2013
By
…learning LaTeX, from scratch!

” LaTeX is a high-quality typesetting system; it includes features designed for the production of technical and scientific documentation, and is the de facto standard for the communication and publication of scientific documents.” It is also… Free and Open. Specially … Sigue leyendo →

Read more »

…start using Sweave, from scratch!

May 1, 2013
By
…start using Sweave, from scratch!

INTRODUCTION Sweave is nothing more, nothing less than the best way R can connect with a text editor, in this case LaTeX. So you don’t know anyting about LaTeX? neither did I 8 months ago… The hyperlinks in this post … Sigue leyendo →

Read more »

…about R, for beginners

April 29, 2013
By
…about R, for beginners

These days I was remembering my beginnings as a linux user few years ago, and how I found R (possibly in a very unlikely way: searching for a SPSS alternative in Linux). For two years, R had been almost impossible … Sigue leyendo →

Read more »