Monthly Archives: February 2011

Using R for Introductory Statistics, Chapter 5, Probability Distributions

February 9, 2011
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Using R for Introductory Statistics, Chapter 5, Probability Distributions

In Chapter 5 of Using R for Introductory Statistics we get a brief introduction to probability and, as part of that, a few common probability distributions. Specifically, the normal, binomial, exponential and lognormal distributions make an appearance. For each distribution, R provides four functions whose names start with the letters d, p, q or r followed by...

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Using R for Introductory Statistics, Chapter 5, Probability Distributions

February 9, 2011
By
Using R for Introductory Statistics, Chapter 5, Probability Distributions

In Chapter 5 of Using R for Introductory Statistics we get a brief introduction to probability and, as part of that, a few common probability distributions. Specifically, the normal, binomial, exponential and lognormal distributions make an appearance....

Read more »

Create a Web Crawler in R

February 8, 2011
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Create a Web Crawler in R

Admittedly I am not the best R coder, and I certainly have a lot to learn, but the code at the link below should provide you with an example of how easy it is to create a very (repeat: very) basic web crawler in R.  If you wanted to do this in SPSS, and I

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Opinions Not Backed by Money Are Not That Believable–Updated and with R

February 8, 2011
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Opinions Not Backed by Money Are Not That Believable–Updated and with R

As an update to http://timelyportfolio.blogspot.com/2010/12/opinions-not-backed-with-money-are-not.html, I have updated the revised data, added the past two months, and translated to R. If the world really is overly bullish on stocks as some suggest, I...

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Ubuntu – Installing R and RGedit Plugin

February 8, 2011
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Ubuntu – Installing R and RGedit Plugin

R is a fantastic bit of software which I have been using on and off for a number of years since I gave up on SAS due to their (free for academics) annoying licenses and limited support for the things I wanted to do – R is infinitely flexible and totally free. Installing R on

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Utilizing multiple cores in R

February 8, 2011
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There are a couple of options in R, if you want to utilize multiple cores on your machine. These days my favorite is doMC package, which depends on foreach and multicore packages.in the section below squareroot for each number is calculated in parallel...

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Utilizing multiple cores in R

February 8, 2011
By

There are a couple of options in R, if you want to utilize multiple cores on your machine. These days my favorite is doMC package, which depends on foreach and multicore packages.in the section below squareroot for each number is calculated in parallel...

Read more »

command line options in R: "optparse" package

February 8, 2011
By

C/python style option parsing now available in R with "optparse" package. Check the documentation here and see below to see how it [email protected] scripts $ Rscript filter.transcripts.by.ncRNA.R -husage:  usage: filter.transcripts.by.ncRNA.R [op...

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command line options in R: "optparse" package

February 8, 2011
By

C/python style option parsing now available in R with "optparse" package. Check the documentation here and see below to see how it [email protected] scripts $ Rscript filter.transcripts.by.ncRNA.R -husage:  usage: filter.transcripts.by.ncRNA.R [op...

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sqldf and grouping rows in R

February 8, 2011
By

In R, you can treat tables (or data.frames as they are called in R) as SQL tables. That means you can query them as you would query a database with SQL commands. This is particularly useful 1) if you know SQL, hahah:)  2) if you have large tabl...

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