# Monthly Archives: July 2012

## Really Big Objects Coming to R

July 25, 2012
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I noticed in the development version of R the following note in the NEWS file: There is a subtle change in behaviour for numeric index values 2^31 and larger.  These used never to be legitimate and so were treated as NA, sometimes with a warning.

## Measuring persistence in a time series : Application of rolling window regression

During my final semester at IGIDR I did a project paper in macroeconomics involving timeseries econometrics. The concept that I focused on my study was unit root, which I have touched upon in my earlier posts. This study presents a novel...

## Displaying time series, spatial and space-time data with R

During next months I will be working on the book “Displaying time series, spatial and space-time data with R: stories …Continuar leyendo »

## RcppClassic 0.9.2

July 24, 2012
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Similar to yesterday's post about RcppGSL, we have another pure maintenance release to announce, this time of RcppClassic, the package supporting the deprecated older classic Rcpp API defined in the earlier 2005 to 2006 releases, is now on CRAN. Ther...

## Civic Data Challenge closes July 29

July 24, 2012
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There's only a few days left to enter the Civic Data Challenge: entries are due before midnight EST on July 29 to qualify for the \$100,000 in prizes. The competition, open to US residents, challenges particpants to applications and visualizations from civic health data. Prizes will be awarded by a panel of prestigious judges. Looks like a great opportunity...

## How to tell when error bars correspond to a significant p-value

July 24, 2012
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Can you tell when error bars based on 95 % CIs or standard errors correspond to a significant p-value? Don’t fret if you think it’s hard, a study from 2005 showed that researchers in psychogoly, behavior neuroscience and medicine had a hard time judging when error bars from two independent groups signified a significant difference.

## get UCSC images for a list of regions in batch

July 24, 2012
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Here is my working R code for the task. It can be simplified as 3 lines.# example of controling individual track#theURL="http://genome.ucsc.edu/cgi-bin/hgTracks?db=mm9&wgRna=hide&cpgIslandExt=pack&ensGene=hide&mrna=hide&intronEst=hi...

## The Failure of Asset Allocation – Bonds Are An Imperfect Hedge

July 24, 2012
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US investors were spoiled by US Treasuries which acted as a near perfect hedge to stocks during the 2008-2009 crisis.  However, in real crisis, bonds rarely offer any comfort, and asset allocation fails (see post Death Spiral of a Country and IMF ...

## What’s wrong with LOESS for palaeo data?

July 24, 2012
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$What’s wrong with LOESS for palaeo data?$

Locally weighted scatterplot smoothing (LOWESS) or local regression (LOESS) is widely used to highlight “signal” in variables from stratigraphic sequences. It is a user-friendly way of fitting a local model that derives its form from the data themselves rather than having … Continue reading →

## Williams designs with 5 products

July 24, 2012
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In a previous post I created small Williams designs for an even number of products. This worked very well, also because the number of permutations could be restricted significantly due to symmetry. Unfortunately this does not work so well with an odd n...