# 2585 search results for "twitter"

## I may have ventured into the first circle and Virgil Is NOT Here — Lehmann Primality Test in R

December 20, 2011
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So a post about Lehmann Primality Tests in HackerNews came across my twitter this morning. Seemed like a great quick coding exercise during lunch. Little Did I know…It is wonderfully simple primality test but i think i have hit up against some R quir...

## Rotational Trading Strategies: borrowing ideas from Engineering Returns

December 19, 2011
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Frank Hassler at Engineering Returns blog wrote an excellent article Rotational Trading: how to reduce trades and improve returns. The article presents four methods to reduce trades: Trade less frequently. I.e. weekly instead of daily rebalancing. Different criteria for enter / exit a trade. Smooth the rank over the last couple of bars. Combination of

## IRIS Flower Data Set (R-001)

December 17, 2011
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IRIS Flower Data SetEste es el Link a Wikipedia donde podéis encontrar los datos que utilizó Fisher en su trabajo de 1936. Ya hemos trabajado con estos datos en Excel y los continuaremos usando en nuevas entradas.En este link, podemos ver las fotos de las flores (IRIS en castellano son lírios).Represento como LS (longitud del sépalo), AS...

## semi-automatic ABC

December 17, 2011
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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 Fearnhead gave the talk, insisting

## A quick primer on split-apply-combine problems

December 16, 2011
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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 be useful to have a document

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

December 16, 2011
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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 →

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

December 16, 2011
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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 well attended. At one point there were 160 people on...

## Backtesting Rebalancing methods

December 15, 2011
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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 Rebalancing: rebalance to the target

## Bayesian inference and the parametric bootstrap

December 15, 2011
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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 relies on parametric bootstrap—a frequentist

## RMySQL: using the latest MySQL version

December 15, 2011
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In order to connect my R related stuff to a webserver and MySQL I went all the way from using xampp to setting up my own (W)AMPP  (Apache MySQL PHP Perl) to finally back to xampp. And I’m quite happy about this very last switch to xampp! Why I like xampp it can be run … Continue reading...