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1966 until 1976, when SAS Institute was incorporated. A point-and-click interface was added in version 9 in 2004. SAS is a software suite that can mine, alter, manage and retrieve data from a variety of sources and perform statistical analysis on it. SAS programs have DATA steps, which retrieve and manipulate data, and PROC steps, which analyze the data. Each step consists of a series of statements.
The DATA step has executable statements that result in the software taking an action, and declarative statements that provide instructions to read a data set or alter the data’s appearance. The DATA step has two phases: compilation and execution. In the compilation phase, declarative statements are processed and syntax errors are identified. Afterwards, the execution phase processes each executable statement sequentially. Data sets are organized into tables with rows called “observations” and columns called “variables”. Additionally, each piece of data has a descriptor and a value. The PROC step consists of PROC statements that call upon named procedures.
Procedures perform analysis and reporting on data sets to produce statistics, analyses, and graphics. There are more than 300 procedures and each one contains a substantial body of programming and statistical work. PROC statements can also display results, sort data or perform other operations. SAS macros are pieces of code or variables that are coded once and referenced to perform repetitive tasks. SAS data can be published in HTML, PDF, Excel and other formats using the Output Delivery System, which was first introduced in 2007. The SAS Enterprise Guide is SAS’s point-and-click interface. It generates code to manipulate data or perform analysis automatically and does not require SAS programming experience to use.
In 1972, after issuing the first release of SAS, the project lost its funding. According to Goodnight, this was because NIH only wanted to fund projects with medical applications. 1973 and contributed to the software’s econometrics, time series, and matrix algebra. Another early participant, Caroll G. Perkins, contributed to SAS’ early programming. Helwig created SAS’ first documentation.