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A few weeks back, after seeing my replication, one of the original authors of the Flexible Asset Allocation paper got … Continue reading → [Read more...]

by Tim Winke PhD student in Demography and Social Sciences in Berlin This post has been abstracted from Tim's entry to a contest that Dalia Research is running based on a global smarthpone survey that they are conducting. Tim's entry post is available as is all of the code behind ... [Read more...]

Earlier today I saw the hundred bazillionth question about how to use the paste function. My initial response was “take a look at example(paste) to see how it works”. Then I looked at example(paste), and it turns out that it’s not very good at all. There isn’... [Read more...]

This morning, Rcpp reached another round milestone: 300 packages on CRAN now depend on it (as measured by Depends, Imports and LinkingTo declarations). The graph is on the left depicts the growth of Rcpp usage over time. There are 41 more on BioCond... [Read more...]

Recently, Barr et al published a paper in the Journal of Memory and Language, arguing that we should fit maximal linear mixed models, i.e., fit models that have a full variance-covariance matrix specification for subject and for items. I suggest here t... [Read more...]

It is getting colder in London, yet it is still quite mild considering that it is late November. Well, indoors it still feels like 20°C (68°F) to me, but I have been told last week that I should switch on the heating. Luckily I found an old thermometer to check. ... [Read more...]

as the oldest panel survey out there, the bureau of labor statistics' national longitudinal surveys (nls) have been operating so long that justin bieber's grandparents might be too young (and also too legally canadian) to have participated in the initi... [Read more...]

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What the world needs right now is yet another tutorial on R packages and their creation. Luckily, this last Friday and Saturday, I had the opportunity to present in a workshop organized by Frank DiTraglia at Penn's shiny new Warren Center, and held a... [Read more...]

Introduction My statistics education focused a lot on normal linear least-squares regression, and I was even told by a professor in an introductory statistics class that 95% of statistical consulting can be done with knowledge learned up to and including a course in linear regression.  Unfortunately, that advice has turned out ... [Read more...]

I am by no means an authoritative source on this, but I think I found out the secret behind htmltools html_print that chooses the RStudio Viewer browser rather than your default browser like utils::browseURL. Here is a quick code snippet that hopefully... [Read more...]

Pipes in R make my life incredibly easy, and I think my code easier to read.   Note, there are a couple different flavors of pipes (see magrittr and pipeR).  For now, I choose pipeR.library(quantmod)library(pipeR)library(ggplot2)getSymbols("^GSPC",from="1900-01-01",auto.assign=F) %____% #get S&... [Read more...]

The data.table package provides an enhanced version of data.frame that allows you to do blazing fast data manipulations. data.table is being used in different fields such as finance and genomics, and is especially useful for those of you that are working with large data sets (e.g. 1... [Read more...]

With so many more devices and instruments connected to the "Internet of Things" these days, there's a whole lot more time series data available to analyze. But time series are typically quite noisy: how do you distinguish a short-term tick up or down from a true change in the underlying ... [Read more...]

R and Data Mining Workshop at AusDM 2014 http://ausdm14.ausdm.org/workshop There will be a half-day workshop on R and Data Mining at the AusDM 2014 conference in Brisbane, Thursday afternoon, 27 November. The workshop will be composed of several sessions on … Continue reading → [Read more...]

My friend, Steve Simpson, introduced me to Philippe Massicotte and Dirk Eddelbuettel’s GTrendsR GitHub package this week. It’s a pretty nifty wrapper to the Google Trends API that enables one to search phrase trends over time. The trend indices that … Continue reading → [Read more...]

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Slides of keynote speeches, tutorials and panelist presentations at the 2014 IEEE International Conference on Big Data can be found at the conference website at links below. (1) Keynote speech http://cci.drexel.edu/bigdata/bigdata2014/keynotespeech.htm - Never-Ending Language Learning, Tom Mitchell – E. Fredkin … Continue reading → [Read more...]