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R is a great tool with lots of resources for genetics, genome-wide association studies, and many other biological applications.  We've covered several places to find help in R in the past, but if you're still apprehensive about diving into R's command-line interface, fear not.  The R commander is a graphical ... [Read more...]

A few weeks ago I needed to export a number of data frames to separate worksheets in an Excel file. Although one could output csv-files from R and then import them manually or with the help of VBA into Excel, I was after a more streamlined solution, as I would ... [Read more...]

If you ever work in Emacs with different files that all have the same name, this tip may be very useful for you. In my experience, this most often happens when working with Makefiles from multiple projects or directories. Assuming you have a buffer visiting a file called Makefile, by ... [Read more...]

OK in the last two tips I explained how functions can return functions and how to leverage expressions. Now lets get complicated. This is really how my testing code works; expressions embeded in expressions that are passed to functions that return fu... [Read more...]

I never really saw a use for these until I started testing code en mass. I found myself doing lots and lots of copy and paste. I heard it from Steve McConnell in his Code Complete book where he said if you are copying and pasting you are programming ... [Read more...]

I've been really busy lately working on my dissertation and applying for jobs. But I've found a few really cool things that I'd like to share. These are pretty complex things so lets break it up into a few tips. First Tip: did you know that you can re... [Read more...]

Recently, friend of my, got investment advise from his broker – long gas, because the price of gas is very low compared to oil. The broker didn’t indicate neither profit target or stop loss… I got hooked on the idea. First of all, I ran linear regression on monthly prices ... [Read more...]

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This post originally appeared on my Wordpress blog on October 4, 2009. I present it here in its original form. In order to honor the last day of the 2009 MLB regular season (excepting the Twins/Tigers tiebreaker Tuesday night), I was reading... [Read more...]

In order to honor the last day of the 2009 MLB regular season (excepting the Twins/Tigers tiebreaker Tuesday night), I was reading a book that combines a few of my favorite thing: statistics, R, and baseball. The book, by Joseph Adler, is called Baseball Hacks, and I highly recommend it ... [Read more...]

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When I am authoring a document in Emacs, such as a report or my CV, it is useful for me to compile the source file periodically to see what the resulting file PDF looks like. I used to run a separate PDF viewer to look at the output, but I ... [Read more...]

Problem : We wish to determine whether or not four different tips produce different readings on a hardness testing machine. An experiment such as these might be part of a gauge capability study. The machine operates by pressingthe tip into a metal test coupon, and frm the depth of the resulting ... [Read more...]

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smoothScatter function is now available also in base R - in the recommended package graphics that is shipped with R. Originally this function was in the genepplotter package from Bioconductor. I really like it since it can nicely plot large datasets. B... [Read more...]

Some weeks ago I switched from Firefox to Safari. While Safari is -- in my experience -- quicker, better looking, and has Top Sites, I was also missing some functionality of firefox. To be more precise, I missed the 'search when start typing' option, a... [Read more...]

This post originally appeared on my Wordpress blog on October 1, 2009. I present it here in its original form. Whether at work or for personal projects, I use ESS a lot to perform interactive data analyses. The ability to write, edit, and su... [Read more...]

R-2.9.2 was released in August. While R can be considered stable and battle-ready, it is also far from stagnation. It is humbling to see such an intelligent and vibrant community helping CRAN grow faster than ever. Every day I see a new package or read a new comment on R-Help [...] [Read more...]