Recently, he's been working on survey data. I want to use alpha cronach but I wonder which packages is better and what are the differences between ltm and psych packag. The data comes from surveys regarding the assessment of the quality of life.
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LTM
https://cran.r-project.org/web/packages/ltm/ltm.pdf
PSYCH
https://cran.r-project.org/web/packages/psych/psych.pdf It took me a 1 minute of google search to find the documentation online for both packages, then ctrl+f and find the way each compute the Cronbach alpha...
RYann
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