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Learn R

Learn R
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Open Classes on Piazza Software Defined Networking Instructor: Nick Feamster, Georgia Tech Start date: May 26th, 2014 Duration: 8 weeks Free Learn more Join Class Linear Circuits Instructor: Bonnie H. Ferri, Georgia Tech Start date: January 6th, 2014 Duration: 9 weeks Free Learn more Join Class Computational Investing, Part I Instructor: Tucker Balch, Georgia Tech Start date: February 22, 2013 Duration: 9 weeks Free Learn more Join Class Game Theory II: Advanced Applications Matthew O. Jackson, Kevin Leyton-Brown, Yoav Shoham Start date: May 27th, 2013 Duration: 7 weeks Free Learn more Join Class Introductory Physics I with Laboratory Instructor: Michael F. Schatz, Georgia Tech Start date: August 19th, 2013 Duration: 16 weeks Free Learn more Join Class

Axes and Text Many high level plotting functions (plot, hist, boxplot, etc.) allow you to include axis and text options (as well as other graphical paramters). For example # Specify axis options within plot() plot(x, y, main="title", sub="subtitle", xlab="X-axis label", ylab="y-axix label", xlim=c(xmin, xmax), ylim=c(ymin, ymax)) For finer control or for modularization, you can use the functions described below. Why R is Hard to Learn by Bob Muenchen R has a reputation of being hard to learn. Some of that is due to the fact that it is radically different from other analytics software. Some is an unavoidable byproduct of its extreme power and flexibility. And, as with any software, some is due to design decisions that, in hindsight, could have been better. If you have experience with other analytics tools, you may at first find R very alien.

GMAT Sentence Correction : Practice Tests and Information All sentence correction questions consist of a sentence with part underlined, followed by 5 answer choices. Your task is to choose the BEST version from the choices given. Sentence correction questions test your knowledge of standard written (American) English. Cynefin, testing & auditing Over the last few weeks following my CAST 2014 talk in New York, while the Stop 29119 campaign has been raging, I have been thinking more about some of the underlying issues. One of these has been the idea of “best practice”, which led me back to the Cynefin Framework. If you don’t know about Cynefin then I strongly recommend that you learn about it and reflect on its implications. The Wikipedia article is a good start, not least because Dave Snowden, Cynefin’s creator, keeps an eye on it. This short video presented by Snowden is also helpful. An overview of the Cynefin Framework

R Introduction We offer here a couple of introductory tutorials on basic R concepts. It serves as background material for our main tutorial series Elementary Statistics withR. The only hardware requirement for most of the R tutorials is a PC with the latest free open source R software installed. R has extensive documentation and active online community support. Statistical Learning About This Course This is an introductory-level course in supervised learning, with a focus on regression and classification methods. The syllabus includes: linear and polynomial regression, logistic regression and linear discriminant analysis; cross-validation and the bootstrap, model selection and regularization methods (ridge and lasso); nonlinear models, splines and generalized additive models; tree-based methods, random forests and boosting; support-vector machines. Some unsupervised learning methods are discussed: principal components and clustering (k-means and hierarchical). This is not a math-heavy class, so we try and describe the methods without heavy reliance on formulas and complex mathematics. We focus on what we consider to be the important elements of modern data analysis.

Get The Wi-Fi Password To 130+ Airports Around The World Everyone knows this problem: you have to spend some hours at the airport and you need some sorts of entertainment. What is the first thing you do? Try to connect to Wi-Fi, of course! Computer security engineer and travel blogger Anil Polat created an interactive map which offers its users WI-FI passwords of networks in airports all over the world. It is absolutely simple to use. Just click on a specific airport and the information about the available connections instantly pop up. Let The Network Do The Work One of the most striking things I see when watching organizations make the transition from legacy industrial models of working to new network-based models, is that we keep trying to employ the new tools and ideas in the same old ways. Certainly, it’s quite hard to unlearn the old methods, so deeply instilled are they by prior experience, history, and momentum. But as businesses, even today, we largely still try to create all the ideas, try to control everything, and focus on doing all the work to produce outcomes within the organization, team, or enterprise, with a little help of perhaps a few closely held suppliers and business partners. In short, most organizations still have an out-dated and overly centralized model for working, and it’s turned out to be a very difficult habit to break. If I have a single key lesson that every organization seeking to digitally transform must learn it’s this: You must let the network do the work. Additional Reading:

List A list is a generic vector containing other objects. For example, the following variable x is a list containing copies of three vectors n, s, b, and a numeric value 3. > n = c(2, 3, 5) > s = c("aa", "bb", "cc", "dd", "ee") > b = c(TRUE, FALSE, TRUE, FALSE, FALSE) > x = list(n, s, b, 3) # x contains copies of n, s, b List Slicing We retrieve a list slice with the single square bracket "[]" operator. The following is a slice containing the second member of x, which is a copy of s.