TY  - GEN
AU  - Sijtsma, Klaas
AU  - Molenaar, Ivo W.
TI  - Introduction to nonparametric item response theory
AV  - QA278.8 Sij
PY  - 2002///
PB  - Sage Publications
KW  - Nonparametric statistics
KW  - Item response theory - Statistical methods
N1  - 16155
ER  -