January 2013

Sequential testing in a triangle test setting

January 6, 2013 | Wingfeet

It is well known the binomial test never has an error of exactly 5%. You aim for at most 5%, calculate the number correct to get there and end up with an error of e.g 2%. This is a shame but there is no solution. However, it is also an opportunity; the... [Read more...]

tolower() – error catching unmappable characters

January 6, 2013 | Raymond Tse

The tolower() function returns an error where it can’t map to the Unicode character set of the input data – a common occurrence when analysing social media data with emoticons. Emoticons are those symbols that are commonly used on mobile phones but aren’t always recognised on all platforms. For ... [Read more...]

Using the Rcpp Timer

January 6, 2013 | Rcpp Gallery

Sine the 0.10.2 release, Rcpp contains an internal class Timer which can be used for fine-grained benchmarking. Romain motivated Timer in a post to the mailing * list where Timer is used to measure the different components of the costs of random number... [Read more...]

The statistics software signal

January 5, 2013 | andrew

Tyler Cowen links to a post by Sean Taylor, who writes the following about users of R: You are willing to invest in learning something difficult. You do not care about aesthetics, only availability of packages and getting results quickly. To me, R is easy and Sas is difficult. I ... [Read more...]

R/Finance 2013 Call for Papers

January 5, 2013 | Peter Carl

It’s that time of year again – we’ve just posted our Call for Papers for the R/Finance 2013 conference, which focuses on applied finance using R. This is our fifth annual conference, again organized by a group of R package authors and community contributors and hosted by the International ... [Read more...]

Monotonic deshrinking in weighted averaging models

January 5, 2013 | ucfagls

Weighted averaging regression and calibration is the most widely used method for developing a palaeolimnological transfer function. Such models are used to reconstruct properties of the past lake environment such as pH, total phosphorus, and water temperature with, it has … Continue reading → [Read more...]

National identification number: Finland part 3

January 5, 2013 | Xachriel

Last part of our short series about the Finnish social security number (Fssn). You can check part 1 here, and part 2 here. This last post we are interested in generating random Fssn's. This has no real world applications. It is just a coding excercis... [Read more...]

National identification number: Finland part2

January 5, 2013 | Xachriel

Continuing our theme from last time. The Finnish social security number (FSSn) has the form xxxxxxyzzzq, where the check digit is q. If you want to check if the FSSn is real the check digit is matched to the remainder of xxxxxxzzz / 31. The check di... [Read more...]

Calling R Functions from C++

January 5, 2013 | Rcpp Gallery

At its very essence, Rcpp permits easy access to native R objects at the C++ level. R objects can be simple vectors, list or matrices; compound data structures created from these; objects of S3, S4 or Reference Class vintage; or language objects a... [Read more...]

Find Out Available Usernames with R

January 5, 2013 | Yihui Xie

Update on 2013/01/05: Xiao Nan in the comments pointed out that apply(combn(letters, 2), 2, paste0, collapse = '') was wrong for all two-letter usernames, and indeed it was. It is not a combination problem. Now I use his elegant outer() solution. One can also use expand.grid(letters, letters). Github decided to ... [Read more...]

IBS reversion edge with QuantShare

January 4, 2013 | Intelligent Trading

Happy New Years to readers; my resolution this year is to continue delivering thoughts and ideas to others in the hopes that we all might be able to benefit somewhat from sharing observations. I'll start by describing an edge using QuantShare as the b... [Read more...]

PLS Path Modeling with R

January 4, 2013 | Gaston Sanchez

Today I’m very happy and so excited to announce my new book PLS Path Modeling with R, freely available in pdf format at:  www.gastonsanchez.com/PLS_Path_Modeling_with_R.pdf After working and writing insanely for a couple of months in the last quarter of 2012, I’ve ... [Read more...]

Solving 9-puzzle with GNU R

January 4, 2013 | Bogumił Kamiński

During holiday break I have decided to solve 9-puzzle, which is 3x3 variant of a well known 15-puzzle. The solution has proven to be a nice application of igraph package. Warning: this time the code takes a bit more tame than usual in my... [Read more...]

New AQP Tutorials

January 4, 2013 | dylan

Soil Series Extent Several new AQP-related tutorials have been posted to the R-Forge project page. SoilProfileCollection class/method documentation soil series extent mapping examples read more [Read more...]
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