Hexadecimal literals in GNU R
(This article was first published on R snippets, and kindly contributed to R-bloggers) Recently I have used hexadecimal numbers in GNU R. The way they are parsed surprised me and is inconsistent with...
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GNU R loop speed comparison
(This article was first published on R snippets, and kindly contributed to R-bloggers) Recently I had several discussions about using for loops in GNU R and how they compare to *apply family in terms...
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Simple Bayesian bootstrap
(This article was first published on R snippets, and kindly contributed to R-bloggers) Bootstrapping is a very popular statistical technique. However, its Bayesian analogue proposed by Rubin (1981) is...
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Estimating continuous piecewise linear regression
(This article was first published on R snippets, and kindly contributed to R-bloggers) When talking about smoothing splines a simple point to start with is a continuous piecewise linear regression...
View ArticleMissing tikzDevice
(This article was first published on R snippets, and kindly contributed to R-bloggers) I love using tikzDevice. When preparing LaTeX documents I switched to prepare all graphs in GNU R and then port...
View ArticleModel fitting exam problem
(This article was first published on R snippets, and kindly contributed to R-bloggers) Recently I have run an exam where the following question had risen many problems for students (here I give its...
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Regression regularization example
(This article was first published on R snippets, and kindly contributed to R-bloggers) Recently I needed a simple example showing when application of regularization in regression is worthwhile. Here...
View ArticleTesting function agruments in GNU R
(This article was first published on R snippets, and kindly contributed to R-bloggers) Recently I have read a nice post on ensuring that proper arguments are passed to a function using GNU R class...
View ArticleWrapper functions in GNU R
(This article was first published on R snippets, and kindly contributed to R-bloggers) Recently I have been working with GNU R optimization routines a lot. Function optim has a nice trace option that...
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Solving 9-puzzle with GNU R
(This article was first published on R snippets, and kindly contributed to R-bloggers) During holiday break I have decided to solve 9-puzzle, which is 3x3 variant of a well known 15-puzzle. The...
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Genetic drift simulation
(This article was first published on R snippets, and kindly contributed to R-bloggers) While preparing for the new teaching semester I have created an implementation of NetLogo GenDrift P local in GNU...
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Visualizing optimization process
(This article was first published on R snippets, and kindly contributed to R-bloggers) One of the approaches to graph drawing is application of so called force-directed algorithms. In its simplest...
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Cont model back after a year
(This article was first published on R snippets, and kindly contributed to R-bloggers) During ESSA2013 conference I had a discussion about Cont model I have commented a year ago.In original paper Cont...
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Cont model – Part II
(This article was first published on R snippets, and kindly contributed to R-bloggers) In my last post I have investigated properties of Cont model (you can download the paper here). Today I would...
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Calibration of p-value under variable selection: an example
(This article was first published on R snippets, and kindly contributed to R-bloggers) Very often people report p-values for linear regression estimates after performing variable selection step. Here...
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Simulatin speed: GNU R vs Julia
(This article was first published on R snippets, and kindly contributed to R-bloggers) Recently there is a lot of noise about Julia. I have decided to test its speed in simulation tasks on my toy Cont...
View ArticleSpeeding up model bootstrapping in GNU R
(This article was first published on R snippets, and kindly contributed to R-bloggers) After my last post I have recurringly received two questions: (a) is it worthwhile to analyze GNU R speed in...
View ArticleGNU R vs Julia: is it only a matter of devectorization?
(This article was first published on R snippets, and kindly contributed to R-bloggers) Recently I have read a post on benefits of code devectorization in Julia. The examples given there inspired me to...
View ArticleTuning optim with parscale
(This article was first published on R snippets, and kindly contributed to R-bloggers) I often get questions what is the use of parscale parameter in optim procedure in GNU R. Therefore I have decided...
View ArticleRGolf
(This article was first published on R snippets, and kindly contributed to R-bloggers) Its time for some fun today - because its Friday as David Smith says :).There are many code golf sites, even some...
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