Monthly Archives: January 2011

Introductory R Books

January 31, 2011
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Introductory R Books

Here's a link to another blog compiling information and recommendations are introductory books on R (not statistics books that use R).  I thought this might be useful for people.http://csgillespie.wordpress.com/2011/01/28/r-programming-books-updated/

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Tricks to manage memory in an R session

January 31, 2011
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Unless you're using an out-of-memory solution to manage large data objects (such as the RevoScaleR package in Revolution R Enterprise), then R always allocates memory for every object in your working session. If you're working with many objects (or even just a few large objects) then you'll need to take care to manage R's memory usage to avoid the...

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sab-R-metrics: Some Extra Visualization Customization

January 31, 2011
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sab-R-metrics: Some Extra Visualization Customization

Last post, I described a number of ways to show your data on a scatter plot. Ricky Zanker at THT has a similar post today for those looking to get some extra exposure and another take on R programming. Today, I plan to extend on this with a little more customization. First, if you've missed...

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Tick data retrieval

January 31, 2011
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I just published Java based code to pull tick data from Interactive Brokers. There are thousands tools to get tick data from IB, but I had one feature in mind. You can get maximum 50 quotes per second from Interactive Brokers (its IB limitation for TWS API) . Imagine a situation, when there is a

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DataMarket

January 31, 2011
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I have just discovered yet another public data site www.datamarket.com. Most of the data are time-series. It collects together things like World bank, Eurostat, Gapminder into the one place. It also allows you to download data as csv files or to creat...

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R Tutorial Series: Two-Way ANOVA with Pairwise Comparisons

January 31, 2011
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R Tutorial Series: Two-Way ANOVA with Pairwise Comparisons

By extending our one-way ANOVA procedure, we can test the pairwise comparisons between the levels of several independent variables. This tutorial will demonstrate how to conduct pairwise comparisons in a two-way ANOVA. Tutorial FilesBefore we begin, yo...

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Example 8.23: Expanding latent class model results

January 31, 2011
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Example 8.23: Expanding latent class model results

In Example 8.21 we described how to fit a latent class model to data from the HELP dataset using SAS and R (using poLCA(), and then followed up in example 8.22 using randomLCA(). In both entries, we classified subjects based on their observed (manifes...

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A gentle introduction to R

January 31, 2011
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A gentle introduction to R

Whenever a post on this blog requires some data analysis and perhaps a chart or two, my tool of choice is the versatile statistical programming package R. Developed as an open-source implementation of an engine for the S programming language, R is therefore free. Since commercial mathematical packages can costs thousands of dollars, this alone

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Good riddance to Excel pivot tables

January 30, 2011
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Good riddance to Excel pivot tables

Excel pivot tables have been how I have reorganized data...up until now. These are just a couple of examples why R is superior to Excel for reorganizing data:################ Good riddance to pivot tables ############library(reshape2)library(plyr)&nbsp...

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ABC model choice not to be trusted [3]

January 30, 2011
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ABC model choice not to be trusted [3]

On Friday, I received a nice but embarrassing email from Xavier Didelot. He indeed reminded me that I attended the talk he gave at the model choice workshop in Warwick last May, as, unfortunately but rather unsurprisingly giving my short span memory!, I had forgotten about it! Looking at the slides he joined to his

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