Monthly Archives: November 2012

is.invasive( )

November 26, 2012
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is.invasive( )

Celebrating that I am contributing to the R-bloggers.com blog aggregator I am going to post a very simple function to check which species (both plants and animals) are considered “invaders” somewhere in the world. Basically the function asks that to … Continue reading →

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Discovering the quality of portfolio decisions

November 26, 2012
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Discovering the quality of portfolio decisions

Performance analysis of an example portfolio. The portfolio We explore a particular portfolio during 2007.  It invests in S&P 500 stocks and starts the year with a value of $10 million.  Initially there are 50 names in the portfolio.  It also ends the year with 50 names but has up to 53 names during the … Continue reading...

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why and how to install monetdb with r on windows

November 26, 2012
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warning: the instructions below are obsolete.  please check this page for the latest version.  <3 anthony whya speed test of three sql queries on sixty-seven million records using my personal computer --# calculate the sum, mean, median, a...

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Minimizing Bias in Observational Studies

November 26, 2012
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Minimizing Bias in Observational Studies

Measuring the effect of a binary treatment on a measured outcome is one of the most common tasks in applied statistics. Examples of these applications abound, like the effect of smoking on health, or the effect of low birth weight on cognitive development. In an ideal world we would like to be able to assign

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Fast Conway’s game of life in R

November 25, 2012
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Fast Conway’s game of life in R

Here I demonstrate a simple way to code Conway's game of life (GoL) in R and to produce the animation above. Cellular automata in R are usually painfully slow if you iterate through all grid cells in an array. A…Read more →

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Mapping Current Average Price Per Sqft for Rentals by Zip in San Fran

November 25, 2012
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Mapping Current Average Price Per Sqft for Rentals by Zip in San Fran

My company, Kwelia, is sitting on mountains of data, so I decided to try my hand at mapping.  I have played around with JGR but it’s just too buggy, at least on my mac, so I went looking for other alternatives and found a good write up here.  I decided on mapping prices per sqft

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The perks (and quirks) of being a referee

November 25, 2012
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The other day I was talking to a friend at work, who was rather annoyed that one of his papers had been rejected by a journal, given the negative comments of the reviewers. This is, of course, part of the game, so you don't really get annoyed just because a paper get rejected. From what I hear, though, I...

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digest 0.6.0

November 25, 2012
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A new version of the digest package (which generates hash function summaries for arbitrary (and possibly nested) R objects using any of the standard md5, sha-1, sha-256, sha-512 or crc32 algorithms) is now on CRAN, and I will push the corresponding ve...

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Yahoo Tickers for DAX,MDAX,SDAX

November 25, 2012
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  In my various R - Tests I'm using usually the Yahoo Dataservice implemented in quantmod suppressWarnings(try(getSymbols(ticker, index.class="POSIXct", from=initDate, to=to,src="yahoo"),silent=TRUE))  If you would like to run ...

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Successive Differences of a Randomly-Generated Timeseries

November 25, 2012
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I was wondering about the null distribution of successive differences of random sequences, and decided to do some numerical experiments. I quickly realized that successive differences equates to taking successively higher-order numerical derivatives, ...

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