Monthly Archives: February 2014

More on Rebalancing | With Data from Research Affiliates

February 24, 2014
By

While on the topic of rebalancing (see Unsolved Mysteries of Rebalancing), I thought it would be good to highlight another good research paper with some quick rCharts analysis. Arnott, Robert D., et al.The Surprising Alpha from Malkiel’s Monkey and ...

Read more »

Quick and dirty notes on General Linear Mix Models

February 24, 2014
By
Quick and dirty notes on General Linear Mix Models

My datasets tend to have random factors. I try to stick to general models whenever I can to avoid dealing with both random factors and complex error distributions (not always possible). I am compiling some notes here to avoid visiting … Continue reading →

Read more »

How to Make a Bad Password with R

February 24, 2014
By
How to Make a Bad Password with R

I have a lot of projects that will take ages to finish (some are in such poor shape that I tuck them away in private repositories, so no one can see my shame).  So sometimes it's nice to just take a weekend and crank out something start to finish, even if it's dumb and no one cares about it...

Read more »

BayesFactor update: 0.9.7.

February 24, 2014
By

BayesFactor version 0.9.7 has been released to CRAN. It does have a few bug fixes, so update soon. A list of changes can be found in the NEWS file.

Read more »

Face To Face With Marilyn Monroe

February 24, 2014
By
Face To Face With Marilyn Monroe

Symmetry is what we see at a glance (Blaise Pascal) Ladies and gentlement, the beautiful Marilyn Monroe: There are several image processing packages in R. In this experiment I used biOps, which turns images into 3D matrices. The third dimension is a 3-array corresponding to (r, g, b) color of pixel defined by two other

Read more »

Remotely deleting files from R

February 23, 2014
By
Remotely deleting files from R

Sometimes programs generate a LOT of files while running scripts. Usually these are important (why else would you be running the script?). However, sometimes scripts generate mountains of temporary files to create summary outputs that aren’t really useful in their … Continue reading →

Read more »

Performing a non-local return in R

February 23, 2014
By
Performing a non-local return in R

In most languages return is a statement, but in R it is a function (in fact R does not really have statements, it only has expressions). This function-like behavior of return is useful for figuring out the order in which operations are performed, e.g., the value returned by return(1)+return(2) tells us that binary operators are

Read more »

New York crime rates

February 23, 2014
By
New York crime rates

While browsing through different sites, I randomly cam across the ominous-sounding disaster center website. There is a fair amount of data that could be analyzed there, but my attention was caught by an entry stating that they had just updated the “1965 to 2012 State Crime Pages”. From there, I chose the completely biased option of

Read more »

Bayes factor t tests, part 2: Two-sample tests

February 23, 2014
By
Bayes factor t tests, part 2: Two-sample tests

In the previous post, I introduced the logic of Bayes factors for one-sample designs by means of a simple example. In this post, I will give more detail about the models and assumptions used by the BayesFactor package, and also how to do simple analyses of two- sample designs.See the previous posts for background: What is a Bayes factor? Bayes factor...

Read more »

twitteR now supports database persistence

February 23, 2014
By

For a long time now I've wanted to add the ability for storing data from twitteR into a RDBMS. In the past I've done things by concatenating new results onto old results which simply becomes unwieldy. I know that many people have doctored up their own ...

Read more »

Search R-bloggers


Sponsors

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)