Welcome!

Java IoT Authors: Liz McMillan, Pat Romanski, Yeshim Deniz, Elizabeth White, Paul Simmons

Blog Feed Post

An Introduction to SAS for R Programmers

by Joseph Rickert Life decisions are usually much too complicated to be attributed to any single cause, but one important reason that I am here at Revolution today is that I ignored suggestions from well-meaning faculty back in graduate school to work more in SAS rather than doing everything in R. There was a heavy emphasis on SAS then: the faculty were worried about us getting jobs. This was before the rise of the data scientist and the the corporate model my professors had in mind was: PhD statisticians do statistics and everyone else writes SAS code. I would not be surprised if this is still not the prevailing model in traditional Statistics programs. My bet is there are statisticians everywhere who have yet to come to grips with the concept of a “data scientist”.  Anyway, because of the great cosmic balance, or the bad karma that comes from ignoring well-intentioned advice and the fact that there are quite a few companies out there that want to convert their SAS code to R, I occasionally get to look at SAS code. In the process of interviewing candidates for this kind of work it struck me that there are many people coming to data science through the programming or machine learning routes who have some R knowledge as well as experience with Java, Python and C++ who have never worked with SAS. To this group I offer the following very brief “Introduction to SAS for R Programmers”. So what is SAS exactly? Originally, SAS  stood for “Statistical Analysis System”. Indeed, towards the beginning of his invaluable book, “R for SAS and SPSS Users”, Bob Muenchen characterizes SAS as a system for statistical computation that has five main components: A data management system for reading, transforming and organizing data (The Data Step) A large number of procedures (PROCs) for statistical analysis and graphics The Output Delivery System for extracting output from PROCs and customizing printed output A macro language for programming in the data step and calling PROCS The Interactive Matrix programming language (IML) for developing new algorithms SAS is not a single programming language. It is an entire ecosystem of products (not all seamlessly integrated) that contains at least two languages! While becoming a competent SAS programmer clearly requires mastering an impressive number of skills, quite a bit can be accomplished in SAS with a basic knowledge of the Data Step and the more common procedures (PROCs) in the base and Stat packages. Moreover, as it turns out, these two foundational components of SAS are the very two things that an R programmer is likely to find most strange about SAS. There is really only one data structure in SAS, a file with rows of observations and columns of variables that always gets processed by means of an implied loop. A Data Step “program” starts with the first row of a SAS file executes all of the code it encounters until it comes to a run; statement then looks at the second row of the file and runs through the code again. The Data Step proceeds sequentially through the entire file in this fashion. An excellent presentation from Steven J. First illustrates the process nicely. See slides 36 through 45 for an example of SAS code with a very clear PowerPoint animation of how this all works. It is true that SAS programmers can work with arrays, but this is actually a computational sleight of hand. Arrays are actually special columns in a data set. R programmers are used to an interactive computational experience. Within a session, at any point in time the objects that resulted from a previous computation are available as inputs to the next calculation. There is always a sense of moving forward. If you didn’t compute something as part of the last function you ran, just write another function and compute it now. In SAS, however, one uses the various PROCS to conjure the results in a methodical, premeditated way. For example, something like the following code would run a simple regression in SAS sending the results to the console. proc reg data = myData;model Y = X;run:  However, if you wanted to have the fitted values and residuals available for a further computation, you would have to rerun the regression specifying an output file and the keywords for computing the fitted values and residuals. proc reg DATA = myData;MODEL Y = X / stb clb;OUTPUT OUT=OUTREG P=PREDCIT R=RESED;run; Kathy Welch a statistical consultant at the University of Michigan, provides a very clear example of this linear way of working. Most SAS programming probably gets done by writing SAS macros. Look at Bob Muenchen’s book (or this article) for practical examples of R functions to replace SAS macros. For more advanced work,the SAS/Tool Kit (yet another add on) allows SAS probrammers to write custom procedures. But, from a R programmer’s perspective probably the most exciting SAS product is the IML System which provides the ability to call R from within an IML procedure. The documentation  provides an example of transferring data stored in SAS/IML vectors to R, running a model in R and then, importing the results back into SAS/IML vectors. Actually, if you are an R programmer, all you might really want to do is import data from SAS to R. Thre are at least five ways to do this using functions from various open source R libraries. (Note that some of these methods require preparation steps to be done in SAS.) The document “An Introduction to S and The Hmisc and Design Libraries” on CRAN is also helpful. However, I recommend using rxImport feature in RevoScaleR package that ships with Revolution R Enterprise. Importing a SAS file with rxImport looks like this: rxImport(inData=data,outFile="sasFileName") Not only is it a one step process that does not require having SAS installed on your system, but it reads .sas7bdat files directly into Revolution Analytics' .xdf file format. You can easily work with SAS files that are too large to fit into memory Once in .xdf file format the data can be worked on with RevoScaleR’s parallel external memory algorithms (PEMAs) or written to .csv files or data frames.

Read the original blog entry...

More Stories By David Smith

David Smith is Vice President of Marketing and Community at Revolution Analytics. He has a long history with the R and statistics communities. After graduating with a degree in Statistics from the University of Adelaide, South Australia, he spent four years researching statistical methodology at Lancaster University in the United Kingdom, where he also developed a number of packages for the S-PLUS statistical modeling environment. He continued his association with S-PLUS at Insightful (now TIBCO Spotfire) overseeing the product management of S-PLUS and other statistical and data mining products.<

David smith is the co-author (with Bill Venables) of the popular tutorial manual, An Introduction to R, and one of the originating developers of the ESS: Emacs Speaks Statistics project. Today, he leads marketing for REvolution R, supports R communities worldwide, and is responsible for the Revolutions blog. Prior to joining Revolution Analytics, he served as vice president of product management at Zynchros, Inc. Follow him on twitter at @RevoDavid

@ThingsExpo Stories
Digital Transformation is much more than a buzzword. The radical shift to digital mechanisms for almost every process is evident across all industries and verticals. This is often especially true in financial services, where the legacy environment is many times unable to keep up with the rapidly shifting demands of the consumer. The constant pressure to provide complete, omnichannel delivery of customer-facing solutions to meet both regulatory and customer demands is putting enormous pressure on...
The best way to leverage your CloudEXPO | DXWorldEXPO presence as a sponsor and exhibitor is to plan your news announcements around our events. The press covering CloudEXPO | DXWorldEXPO will have access to these releases and will amplify your news announcements. More than two dozen Cloud companies either set deals at our shows or have announced their mergers and acquisitions at CloudEXPO. Product announcements during our show provide your company with the most reach through our targeted audienc...
JETRO showcased Japan Digital Transformation Pavilion at SYS-CON's 21st International Cloud Expo® at the Santa Clara Convention Center in Santa Clara, CA. The Japan External Trade Organization (JETRO) is a non-profit organization that provides business support services to companies expanding to Japan. With the support of JETRO's dedicated staff, clients can incorporate their business; receive visa, immigration, and HR support; find dedicated office space; identify local government subsidies; get...
DXWorldEXPO LLC announced today that ICC-USA, a computer systems integrator and server manufacturing company focused on developing products and product appliances, will exhibit at the 22nd International CloudEXPO | DXWorldEXPO. DXWordEXPO New York 2018, colocated with CloudEXPO New York 2018 will be held November 11-13, 2018, in New York City. ICC is a computer systems integrator and server manufacturing company focused on developing products and product appliances to meet a wide range of ...
@DevOpsSummit at Cloud Expo, taking place November 12-13 in New York City, NY, is co-located with 22nd international CloudEXPO | first international DXWorldEXPO and will feature technical sessions from a rock star conference faculty and the leading industry players in the world.
DXWorldEXPO LLC announced today that the upcoming DXWorldEXPO | CloudEXPO New York event will feature 10 companies from Poland to participate at the "Poland Digital Transformation Pavilion" on November 12-13, 2018.
22nd International Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, and co-located with the 1st DXWorld Expo will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud ...
In his keynote at 19th Cloud Expo, Sheng Liang, co-founder and CEO of Rancher Labs, discussed the technological advances and new business opportunities created by the rapid adoption of containers. With the success of Amazon Web Services (AWS) and various open source technologies used to build private clouds, cloud computing has become an essential component of IT strategy. However, users continue to face challenges in implementing clouds, as older technologies evolve and newer ones like Docker c...
Business professionals no longer wonder if they'll migrate to the cloud; it's now a matter of when. The cloud environment has proved to be a major force in transitioning to an agile business model that enables quick decisions and fast implementation that solidify customer relationships. And when the cloud is combined with the power of cognitive computing, it drives innovation and transformation that achieves astounding competitive advantage.
Cloud-enabled transformation has evolved from cost saving measure to business innovation strategy -- one that combines the cloud with cognitive capabilities to drive market disruption. Learn how you can achieve the insight and agility you need to gain a competitive advantage. Industry-acclaimed CTO and cloud expert, Shankar Kalyana presents. Only the most exceptional IBMers are appointed with the rare distinction of IBM Fellow, the highest technical honor in the company. Shankar has also receive...
Michael Maximilien, better known as max or Dr. Max, is a computer scientist with IBM. At IBM Research Triangle Park, he was a principal engineer for the worldwide industry point-of-sale standard: JavaPOS. At IBM Research, some highlights include pioneering research on semantic Web services, mashups, and cloud computing, and platform-as-a-service. He joined the IBM Cloud Labs in 2014 and works closely with Pivotal Inc., to help make the Cloud Found the best PaaS.
In his Opening Keynote at 21st Cloud Expo, John Considine, General Manager of IBM Cloud Infrastructure, led attendees through the exciting evolution of the cloud. He looked at this major disruption from the perspective of technology, business models, and what this means for enterprises of all sizes. John Considine is General Manager of Cloud Infrastructure Services at IBM. In that role he is responsible for leading IBM’s public cloud infrastructure including strategy, development, and offering m...
DXWorldEXPO LLC announced today that All in Mobile, a mobile app development company from Poland, will exhibit at the 22nd International CloudEXPO | DXWorldEXPO. All In Mobile is a mobile app development company from Poland. Since 2014, they maintain passion for developing mobile applications for enterprises and startups worldwide.
Headquartered in Plainsboro, NJ, Synametrics Technologies has provided IT professionals and computer systems developers since 1997. Based on the success of their initial product offerings (WinSQL and DeltaCopy), the company continues to create and hone innovative products that help its customers get more from their computer applications, databases and infrastructure. To date, over one million users around the world have chosen Synametrics solutions to help power their accelerated business or per...
We are seeing a major migration of enterprises applications to the cloud. As cloud and business use of real time applications accelerate, legacy networks are no longer able to architecturally support cloud adoption and deliver the performance and security required by highly distributed enterprises. These outdated solutions have become more costly and complicated to implement, install, manage, and maintain.SD-WAN offers unlimited capabilities for accessing the benefits of the cloud and Internet. ...
Founded in 2000, Chetu Inc. is a global provider of customized software development solutions and IT staff augmentation services for software technology providers. By providing clients with unparalleled niche technology expertise and industry experience, Chetu has become the premiere long-term, back-end software development partner for start-ups, SMBs, and Fortune 500 companies. Chetu is headquartered in Plantation, Florida, with thirteen offices throughout the U.S. and abroad.
Dion Hinchcliffe is an internationally recognized digital expert, bestselling book author, frequent keynote speaker, analyst, futurist, and transformation expert based in Washington, DC. He is currently Chief Strategy Officer at the industry-leading digital strategy and online community solutions firm, 7Summits.
Bill Schmarzo, author of "Big Data: Understanding How Data Powers Big Business" and "Big Data MBA: Driving Business Strategies with Data Science," is responsible for setting the strategy and defining the Big Data service offerings and capabilities for EMC Global Services Big Data Practice. As the CTO for the Big Data Practice, he is responsible for working with organizations to help them identify where and how to start their big data journeys. He's written several white papers, is an avid blogge...
I think DevOps is now a rambunctious teenager - it's starting to get a mind of its own, wanting to get its own things but it still needs some adult supervision," explained Thomas Hooker, VP of marketing at CollabNet, in this SYS-CON.tv interview at DevOps Summit at 20th Cloud Expo, held June 6-8, 2017, at the Javits Center in New York City, NY.
"MobiDev is a software development company and we do complex, custom software development for everybody from entrepreneurs to large enterprises," explained Alan Winters, U.S. Head of Business Development at MobiDev, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.