TY - JOUR TI - An Introduction to the Special Volume on "Psychometrics in R" AB - This special volume presents a select number of psychometric techniques, many of them original, and their implementation in R packages. DO - http://dx.doi.org/10.18637/jss.v020.i01 SP - 1 EP - 5 UR - https://www.jstatsoft.org/article/view/v020i01 PY - 2007-01-01 JO - Journal of Statistical Software AU - de Leeuw, Jan AU - Mair, Patrick ER -