2693 search results for "twitter"

Facebook Graph API Explorer with R

November 10, 2011
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Facebook Graph API Explorer with R

I wanted to play around with the Facebook Graph API  using the Graph API Explorer page as a coding exercise. This facility allows one to use the API with a temporary authorisation token. Now, I don’t know how to make an R package for the proper API where you have to register for an API key and

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Diagram for a Bernoulli process (using R)

November 10, 2011
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Diagram for a Bernoulli process (using R)

A Bernoulli process is a sequence of Bernoulli trials (the realization of n binary random variables), taking two values (0/1, Heads/Tails, Boy/Girl, etc…). It is often used in teaching introductory probability/statistics classes about the binomial distribution. When visualizing a Bernoulli process, it is common to use a binary tree diagram in order to show the Read more...

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Geometric Efficient Frontier

November 9, 2011
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Geometric Efficient Frontier

What is important for an investor? The rate of return is at the top of the list. Does the expected rate of return shown on the mean-variance efficient frontier paints the full picture? If investor’s investment horizon is longer than one period, for example 5 years, than the true measure of portfolio performance is Geometric

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Web Scraping Google Scholar: Part 2 (Complete Success)

November 8, 2011
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Web Scraping Google Scholar: Part 2 (Complete Success)

This is a followup to a post I uploaded earlier today about web scraping data off Google Scholar. In that post I was frustrated because I’m not smart enough to use xpathSApply to get the kind of results I wanted. However fast-forward to the evening whilst having dinner with a friend, as a passing remark,

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Using Text Mining to Find Out What @RDataMining Tweets are About

November 8, 2011
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Using Text Mining to Find Out What @RDataMining Tweets are About

This post shows an example on text mining of Twitter data with R packages twitteR, tm and wordcloud. Package twitteR provides access to Twitter data, tm provides functions for text mining, and wordcloud visualizes the result with a word cloud. … Continue reading →

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Bridge and Torch problem in R

November 8, 2011
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Bridge and Torch problem in R

A couple months ago I came across the bridge and torch problem at a careers fair in Oxford. A young tech company called QuBit used it as a brain teaser challenge for would be software engineers to solve before submitting … Continue reading →

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Doing away with “unknown timezone” warnings

November 8, 2011
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Doing away with “unknown timezone” warnings

Timezone stuff can really drive you NUTS - at least if you’re sitting in front of a German Windows-Box This is what I used to do to set my tz: And I always wondered why R would throw “unknown timezone” warnings: Someday I found out that setting tz via `options()` was not enough as the … Continue reading...

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ABC on wordpress

November 7, 2011
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ABC on wordpress

Erkan Buzbas sent me an email about his webpage (operated as a wordpress blog) on ABC. It contains different items of information on ABC research and an hopefully growing list of references. After Scott Sisson’s tweet on ABC_research (latest news: two ABC sessions in ISBA 20122, Kyoto),  here comes another way to keep posted about

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Web Scraping Google URLs

November 7, 2011
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Web Scraping Google URLs

Google slightly changed the html code it uses for hyperlinks on search pages last Thursday, thus causing one of my scripts to stop working. Thankfully, this is easily solved in R thanks to the XML package and the power and simplicity of XPath expressions: Lovely jubbly! P.S. I know that there is an API of

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Code Optimization: One R Problem, Eleven Solutions – Now Thirteen!

November 7, 2011
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Code Optimization: One R Problem, Eleven Solutions – Now Thirteen!

Following up from my previous post “Code Optimisation: One R Problem, Ten Solutions – Now Eleven!” I figured out a twelfth solution after writing that blog post. Furthermore, half way through writing this blog post I figured out a thirteenth solution too. As a recap, the problem is taken from rwiki where the goal is to find

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