\contentsline {section}{\numberline {1}Overview of this and related documents}{2}{section.1} \contentsline {section}{\numberline {2}Install R and relevant packages}{4}{section.2} \contentsline {subsection}{\numberline {2.1}Install R for the first time}{4}{subsection.2.1} \contentsline {subsubsection}{\numberline {2.1.1}Install R }{5}{subsubsection.2.1.1} \contentsline {subsubsection}{\numberline {2.1.2}Install relevant packages}{11}{subsubsection.2.1.2} \contentsline {paragraph}{Install the minimum set}{11}{section*.2} \contentsline {paragraph}{Install the {\textit {sem}} package as well}{11}{section*.3} \contentsline {paragraph}{Install all the psychometric packages from the psychometrics'' task view.}{12}{section*.4} \contentsline {section}{\numberline {3}Read in the data}{12}{section.3} \contentsline {subsection}{\numberline {3.1}Copy the data from another program using the copy and paste commands of your operating system}{12}{subsection.3.1} \contentsline {subsection}{\numberline {3.2}Import from an SPSS or SAS file}{13}{subsection.3.2} \contentsline {section}{\numberline {4}Some simple descriptive statistics before you start}{14}{section.4} \contentsline {section}{\numberline {5}Using the {\texttt {omega}} function to find $\omega$}{15}{section.5} \contentsline {subsection}{\numberline {5.1}Background on the $\omega$ statistics}{15}{subsection.5.1} \contentsline {subsection}{\numberline {5.2}Using the {\texttt {omega}} function}{17}{subsection.5.2} \contentsline {subsection}{\numberline {5.3}Estimating $\omega _h$ using Confirmatory Factor Analysis}{18}{subsection.5.3}