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SAS™ (SAS Institute, 2009) and R (R development core team, 2009) are two statistical software packages used in many fields of research. SAS is commercial software developed by SAS Institute; it includes well-validated statistical algorithms. It can be licensed but not purchased. Paying for a license entitles the licensee to professional customer support. However, licensing is expensive and SAS sometimes incorporates new statistical methods only after a significant lag. In contrast, R is free, open
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