December 2011

Ripley on model selection, and some links on exploratory model analysis

December 17, 2011 | 0 Comments

This is really fun. I love how Ripley thinks, with just about every concept considered in broad generality while being connected to real-data examples. He’s a great statistical storyteller as well. . . . and Wickham on exploratory model analysis I came across Ripley’s slides in a reference from Hadley Wickham’... [Read more...]

knitr: nice alternative for Sweave

December 17, 2011 | 0 Comments

I recently discovered knitr for dynamic report generation in R. It seems like a very powerful alternative to Sweave. Particularly, I am interested in png graphic device support (it supports more than 20 graphic devices) and R code formatting.Check it o... [Read more...]

semi-automatic ABC

December 17, 2011 | 0 Comments

The talk of Wednesday afternoon Ordinary Meeting of the Royal Statistical Society went on quite well, I think. I would have expected a few people (in general) and some specific people (in particular) but this being the last week of term the schedule was not the best of times. Paul ... [Read more...]

ai-class.com vs ml-class.com

December 16, 2011 | 0 Comments

For those who did not know, Stanford university offered free off charge 3 courses at beginning of the autumn. It is kind of shocking – US based institution offers education for free! Take any socialism oriented country and one of the promises is education for free. But it seems, that the argument ... [Read more...]

Poor, Poor Hillary

December 16, 2011 | 0 Comments

This will be the last baby name related post but this came out of part two web scrapping post last month. I was looking for the fastest rising Names. I flip the logic and looked for the fastest declining names in relative popularity. Out of that exerci... [Read more...]

Lattice Explore Bonds

December 16, 2011 | 0 Comments

Since my fifth most popular post has been Bond Market as a Casino Game Part 1, I thought I would use Vanguard Total US Bond Market mutual fund (VBMFX) monthly returns to build our skills in the lattice R package and help visualize the unbelievable run ...
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A quick primer on split-apply-combine problems

December 16, 2011 | 0 Comments

I’ve just answered my hundred billionth question on Stack Overflow that goes something like I want to calculate some statistic for lots of different groups. Although these questions provide a steady stream of easy points, its such a common and basic data analysis concept that I thought it would ... [Read more...]

To Sweave, or not to Sweave, that is the question

December 16, 2011 | 0 Comments

I am about to start writing up the manuscript of my recent biomath seminar (Act 3: Pineda-Krch. 2011. Cycles at the edge of existence: Emergence of quasi-cycles in strongly destabilizedecosystems.). While the slides for the talk were put together using Sweave … Continue reading → [Read more...]

New Powerball (lottery) Rules Will Cost You More

December 16, 2011 | 0 Comments

The popular news are reporting [1,2,3,4,5] that the Multi-State Lottery Commission (MUSL) will change the rules for their lottery game Powerball, effective Jan. 15, 2012. I sent an email to the MUSL (at 8:00am Dec, 14th) asking for the new official rules, but haven't received a response yet (as of 10:30am Dec, 16th). ... [Read more...]

Optimal regularization for smoothing splines

December 16, 2011 | 0 Comments

In smooth.spline procedure one can use df or spar parameter to control smoothing level. Usually they are not set manually but recently I was asked a question which one of them is a better measure of regularizatio...
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CrossValidated: A place to post your statistics questions

December 16, 2011 | 0 Comments

Seth Rogers writes: I [Rogers] am a member of an online community of statisticians where I burn a great deal of time (and a recovering cog sci researcher). Our community website is a peer-reviewed Q and A spanning stats topics ranging from applications to mathematical theory. Our online community consists ...
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Psycho dice and Monte Carlo

December 16, 2011 | 0 Comments

Following Pierre’s post on psycho dice, I want here to see by which average margin repeated plays might be called influenced by mind will. The rules are the following (exerpt from the novel Midnight in the Garden of Good and Evil, by John Berendt): You take four dice and ... [Read more...]

The Bay Area R User Group Meeting on Data Mining with R

December 16, 2011 | 0 Comments

By Joseph Rickert Put up a poster that says something like “Data Mining with R” anywhere in the Bay Area and you will surely draw a crowd. But it was still a bit of a surprise that the monthly meeting of the Bay Area R User’s group was so ... [Read more...]

Backtesting Rebalancing methods

December 15, 2011 | 0 Comments

I wrote about Rebalancing in the Asset Allocation Process Summary post. Deciding how and when to rebalance (update the portfolio to the target mix) is one of the critical steps in the Asset Allocation Process. I want to study the portfolio performance and turnover for the following Rebalancing methods: Periodic ... [Read more...]

Update your Windows PATH – revisited

December 15, 2011 | 0 Comments

Yihui got me psyched a little about GitHub After my last post about running your R infrastructure from an USB drive, he commented on my function that would update the Windows PATH (which is at least important for R and Rtools). Now I found some time to polish it a ... [Read more...]

EMC survey differentiates BI and Data Science

December 15, 2011 | 0 Comments

EMC last week published the results of a survey of 462 IT decision makers who self-identified as either a data scientist or business intelligence professional (plus 35 invitees who were attendees at the EMC Data Scientist Summity and/or Kaggle competitors). There's a nice summary of the conclusions at the EMC blog, (... [Read more...]

Bayesian inference and the parametric bootstrap

December 15, 2011 | 0 Comments

This paper by Brad Efron came to my knowledge when I was looking for references on Bayesian bootstrap to answer a Cross Validated question. After reading it more thoroughly, “Bayesian inference and the parametric bootstrap” puzzles me, which most certainly means I have missed the main point. Indeed, the paper ... [Read more...]

Query a MySQL Database from R using RMySQL

December 15, 2011 | 0 Comments

I use this all the time, and the setup is dead simple. Follow the code below to load the RMySQL package, connect to a database (here the UCSC genome browser's public MySQL instance), set up a function to make querying easier, and query the database to ... [Read more...]
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