Generating reports was also added through the PUT and FILE statements. The INPUT and INFILE statements were improved so they could read most data formats used by IBM mainframes. In 1976, Barr, Goodnight, Sall, and Helwig removed the project from North Carolina State and incorporated it as the SAS Institute, Inc. The following year a full version was released as SAS 72, which introduced the MERGE statement and added features for handling missing data or combining data sets. It was used only on IBM mainframes and had the main elements of SAS programming, such as the DATA step and the most common procedures, i.e. In 1971, SAS 71 was published as a limited release. The first versions of SAS were named after the year in which they were released. Helwig created SAS's first documentation. Perkins, contributed to SAS' early programming. John Sall joined the project in 1973 and contributed to the software's econometrics, time series, and matrix algebra. Goodnight continued teaching at the university for a salary of $1 and access to mainframe computers for use with the project, until it was funded by the University Statisticians of the Southern Experiment Stations the following year. According to Goodnight, this was because NIH only wanted to fund projects with medical applications. In 1972, after issuing the first release of SAS, the project lost its funding. In 1968, Barr and Goodnight integrated new multiple regression and analysis of variance routines. Barr was joined by student James Goodnight, who developed the software's statistical routines, and the two became project leaders. and was originally intended to analyze agricultural data to improve crop yields. The project was funded by the National Institutes of Health. The development of SAS began in 1966 after North Carolina State University re-hired Anthony Barr to program his analysis of variance and regression software so that it would run on IBM System/360 computers.
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