SSD for R: A Comprehensive Statistical Package to Analyze Single-System Data

Charles Auerbach, Wendy Zeitlin Schudrich

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The need for statistical analysis in single-subject designs presents a challenge, as analytical methods that are applied to group comparison studies are often not appropriate in single-subject research. SSD for R is a robust set of statistical functions with wide applicability to single-subject research. It is a comprehensive package of statistical tests and produces accompanying graphs for almost every function. These include, among others, tests of autocorrelation, t-tests, effect sizes, median and celeration χ2 analyses, and control charts. All functions and graphs are described in a series of tables. Since SSD for R is open source, it is freely available and can be accessed on the authors' website, Additional support, including video tutorials and sample data are also available at no charge.

Original languageEnglish
Pages (from-to)346-353
Number of pages8
JournalResearch on Social Work Practice
Issue number3
StatePublished - May 2013


  • single-system design
  • statistical software


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