00870nam0-22003011i-450-99000383938040332190-6695-11-3000383938FED01000383938(Aleph)000383938FED0100038393820011114d1999----km-y0itay50------baengy-------001yyItem nonresponseoccurrence, causes, and imputation of missing answers to test itemsMark HuismanLeidenDSWO press1999185 p.23 cmM&T series32Indagini campionarietecnichePianificazioni di indaginiHuisman,Mark145463ITUNINARICAUNIMARCBK990003839380403321XV-D-178608MASMASItem nonresponse506988UNINA