RT Article T1 Factor Analysis in the 1980's and the 1990's: Some Old Debates and Some New Developments JF Trends and perspectives in empirical social research SP 201 OP 223 A1 Steiger, James H. LA English YR 1994 UL https://krimdok.uni-tuebingen.de/Record/152588493X SN 3110143127 K1 Faktorenanalyse