RT Article T1 A comparison of nonresponse in mail, telephone, and face-to-face survey. Applying multilevel modeling to meta-analysis JF Quality & quantity VO 28 IS 4 SP 329 OP 344 A1 Hox, Joop J. 1949- A2 Leeuw, Edith D. de LA English YR 1994 UL https://krimdok.uni-tuebingen.de/Record/1639446052 K1 Quantitative Sozialforschung K1 Befragungsmethoden K1 Verweigerquote