Editing Psychological statistics (section)

==Software packages for psychological research==

Various software packages are available for statistical methods for psychological research. They can be classified as commercial software (e.g., [[JMP (statistical software)|JMP]] and [[SPSS]]) and open-source (e.g., [[R (programming language)|R]]). Among the open-source offerings, the R software is the most popular. There are many online references for R and specialized books on R for Psychologists are also being written.<ref>Belhekar, V. M. (2016). Statistics for Psychology Using R, New Delhi: SAGE. {{ISBN|9789385985003}}</ref> The "psych" package of R is very useful for psychologists. Among others, "lavaan", "sem", "ltm", "[[ggplot2]]" are some of the popular packages. PSPP and [[KNIME]] are other free packages. Commercial packages include JMP, SPSS and [[SAS (software)|SAS]]. JMP and SPSS are commonly reported in books.