R & b là gì


R is hot. Whether measured by more than 10,000 add-on packages, the 95,000+ members of LinkedIn"s R group or the more than 400 R Meetup groups currently in existence, there can be little doubt that interest in the R statistics language, especially for data analysis, is soaring.

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Why R? It"s không tính phí, open source, powerful and highly extensible. "You have a lot of prepackaged stuff that"s already available, so you"re standing on the shoulders of giants," Google"s chief economist told The Thủ đô New York Times baông xã in 2009.

Learn khổng lồ use R: Your hands-on guide

Because it"s a programmable environment that uses command-line scripting, you can store a series of complex data-analysis steps in R. That lets you re-use your analysis work on similar data more easily than if you were using a point-and-cliông chồng interface, notes Hadley Wicksi, author of several popular R packages & chief scientist with RStudio.

< Further reading: Learn R for beginners with our PDF. >

That also makes it easier for others lớn validate retìm kiếm results and kiểm tra your work for errors -- an issue that cropped up in the news recently after an Excel coding error was amuốn several flaws found in an influential economics analysis report known as Reinhart/Rogoff.

The error itself wasn"t a surprise, blogs Christopher Gandrud, who earned a doctorate in quantitative research methodology from the London School of Economics. "Despite our best efforts we always will" make errors, he notes. "The problem is that we often use tools & practices that make it difficult to lớn find và correct our mistakes."

Sure, you can easily examine complex formulas on a spreadsheet. But it"s not nearly as easy lớn run multiple data sets through spreadsheet formulas to lớn check results as it is lớn put several data sets through a script, he explains.

Indeed, the mantra of "Make sure your work is reproducible!" is a comtháng theme ahy vọng R enthusiasts.

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Who uses R?

Relatively high-profile users of R include:

Google: There are more than 500 R users at Google, according to David Smith at Revolution Analytics, doing tasks such as making online advertising more effective sầu.

National Weather Service: Flood forecasts.

Orbitz: Statistical analysis khổng lồ suggest best hotels lớn promote khổng lồ its users.

Trulia: Statistical modeling.

Source: Revolution Analytics

Why not R? Well, R can appear daunting at first. That"s often because R syntax is different from that of many other languages, not necessarily because it"s any more difficult than others.

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"I have written software professionally in perhaps a dozen programming languages, và the hardest language for me to learn has been R," writes consultant John D. Cook in a Web post about R programming for those coming from other languages. "The language is actually fairly simple, but it is unconventional."

And so, this guide. Our alặng here isn"t R mastery, but giving you a path to start using R for basic data work: Extracting key statistics out of a data set, exploring a data phối with basic graphics và reshaping data khổng lồ make it easier lớn analyze.