http://www.rensenieuwenhuis.nl "The extra-ordinary lies within the curve of normality" Thu, 10 Jun 2010 10:00:30 +0000 en hourly 1 http://wordpress.org/?v=3.0 http://www.rensenieuwenhuis.nl/index-of-the-r-sessions/ http://www.rensenieuwenhuis.nl/index-of-the-r-sessions/#comments Mon, 17 May 2010 10:00:19 +0000 Rense Nieuwenhuis http://www.rensenieuwenhuis.nl/?p=1209 http://www.rensenieuwenhuis.nl/index-of-the-r-sessions/feed/ 2 http://www.rensenieuwenhuis.nl/r-sessions-33-select-nested-observations-with-equal-number-of-occurences/ http://www.rensenieuwenhuis.nl/r-sessions-33-select-nested-observations-with-equal-number-of-occurences/#comments Wed, 23 Sep 2009 10:00:05 +0000 Rense Nieuwenhuis http://www.rensenieuwenhuis.nl/?p=1107 http://www.rensenieuwenhuis.nl/r-sessions-33-select-nested-observations-with-equal-number-of-occurences/feed/ 0 http://www.rensenieuwenhuis.nl/r-sessions-31-combining-lmer-output-in-a-single-table/ http://www.rensenieuwenhuis.nl/r-sessions-31-combining-lmer-output-in-a-single-table/#comments Thu, 05 Feb 2009 11:00:38 +0000 Rense Nieuwenhuis http://www.rensenieuwenhuis.nl/?p=891 http://www.rensenieuwenhuis.nl/r-sessions-31-combining-lmer-output-in-a-single-table/feed/ 1 http://www.rensenieuwenhuis.nl/r-sessions-30-visualizing-missing-values/ http://www.rensenieuwenhuis.nl/r-sessions-30-visualizing-missing-values/#comments Thu, 08 Jan 2009 10:00:39 +0000 Rense Nieuwenhuis http://www.rensenieuwenhuis.nl/?p=872 It always takes some time to get a grip on a new dataset, especially large ones. The code-books are often as indispensable as they are massive, and not always as clear as one would want. Routings, and resulting and strange patterns of missing values are at times difficult to find. I found a nice way to plot missing values, using R. Basically, I thought it would be nice to calculate the percentage of missings on each variable, and do so for each year represented in the data. These numbers could be visualized using a levelplot(), which resulted in the graph below.]]> http://www.rensenieuwenhuis.nl/r-sessions-30-visualizing-missing-values/feed/ 0 http://www.rensenieuwenhuis.nl/r-sessions-29-running-r-project-twice-on-apple-mac-os-x/ http://www.rensenieuwenhuis.nl/r-sessions-29-running-r-project-twice-on-apple-mac-os-x/#comments Mon, 24 Nov 2008 10:00:40 +0000 Rense Nieuwenhuis http://www.rensenieuwenhuis.nl/?p=835 http://www.rensenieuwenhuis.nl/r-sessions-29-running-r-project-twice-on-apple-mac-os-x/feed/ 1 http://www.rensenieuwenhuis.nl/r-sessions-28-impressive-r-speeds/ http://www.rensenieuwenhuis.nl/r-sessions-28-impressive-r-speeds/#comments Thu, 30 Oct 2008 10:00:22 +0000 Rense Nieuwenhuis http://www.rensenieuwenhuis.nl/?p=778 http://www.rensenieuwenhuis.nl/r-sessions-28-impressive-r-speeds/feed/ 3 http://www.rensenieuwenhuis.nl/r-sessions-26-text-editors-for-r-internal-editor-on-os-x/ http://www.rensenieuwenhuis.nl/r-sessions-26-text-editors-for-r-internal-editor-on-os-x/#comments Mon, 06 Oct 2008 10:00:38 +0000 Rense Nieuwenhuis http://www.rensenieuwenhuis.nl/?p=654 Since R-Project is essentially syntax based, one needs a good text editor to write some code before it is executed in R. And, since we are all writing high quality code, we need a high quality text editor. This is the first in a series on text editors for using with R-Project on MacOSX. The first editor to look at, is the internal one. The Mac OS X version of R-Project comes with quite a strong, although basic, text editor.]]> http://www.rensenieuwenhuis.nl/r-sessions-26-text-editors-for-r-internal-editor-on-os-x/feed/ 0 http://www.rensenieuwenhuis.nl/r-sessions-25-book-mixed-effects-models-in-s-and-s-plus-pinheiro-bates-2000/ http://www.rensenieuwenhuis.nl/r-sessions-25-book-mixed-effects-models-in-s-and-s-plus-pinheiro-bates-2000/#comments Wed, 01 Oct 2008 10:00:51 +0000 Rense Nieuwenhuis http://www.rensenieuwenhuis.nl/?p=628 Despite the reference to S and S-PLUS in the title of this book, it offers an excellent guide for the nlme-package in R-Project. Reason for this is the close resemblance between R and S. The nlme-package, available in R-Project for estimation of both linear and non-linear multilevel models, is written and maintained by the authors of this book. ]]> http://www.rensenieuwenhuis.nl/r-sessions-25-book-mixed-effects-models-in-s-and-s-plus-pinheiro-bates-2000/feed/ 5 http://www.rensenieuwenhuis.nl/r-sessions-23-book-data-analysis-using-regression-and-multilevelhierarchical-models-gelman-hill-2007/ http://www.rensenieuwenhuis.nl/r-sessions-23-book-data-analysis-using-regression-and-multilevelhierarchical-models-gelman-hill-2007/#comments Tue, 23 Sep 2008 10:00:05 +0000 Rense Nieuwenhuis http://www.rensenieuwenhuis.nl/?p=608 Andrew Gelman is known for his expertise on Bayesian statistics. Based on that knowledge he wrote a book in multilevel regression using R and WINbugs. This book aims to be a thorough description of (multilevel) regression techniques, implementation of these techniques in R and bugs, and a guide on interpreting the results of your analyses. Shortly put, the books excels on all three subjects. ]]> http://www.rensenieuwenhuis.nl/r-sessions-23-book-data-analysis-using-regression-and-multilevelhierarchical-models-gelman-hill-2007/feed/ 1 http://www.rensenieuwenhuis.nl/r-sessions-22-introductory-statistics-with-r-peter-dalgaard-2002/ http://www.rensenieuwenhuis.nl/r-sessions-22-introductory-statistics-with-r-peter-dalgaard-2002/#comments Wed, 17 Sep 2008 10:00:56 +0000 Rense Nieuwenhuis http://www.rensenieuwenhuis.nl/?p=598 Peter Dalgaard is associate professor at the Department of Biostatistics at the University of Copenhagen in Denmark, and a member of the R-Project Core Development team. Also, he is an active participating and respected member of the R-help mailing-list. Based on these experiences, he set to write an introductory book on statistics and R.]]> http://www.rensenieuwenhuis.nl/r-sessions-22-introductory-statistics-with-r-peter-dalgaard-2002/feed/ 0