Robert J. J. Voogt

Mixed Mode Data Collection - A Formal Approach

Willem E. Saris, Robert J. J. Voogt, 2005 .

An Alternative Approach to Correcting Response and Nonresponse Bias in Election Research

Robert J. J. Voogt, R. Voogt, 2005 .

Mixed mode designs: finding the balance between nonresponse bias and mode effects

Willem E. Saris, Robert J. J. Voogt, W. Saris, 2005 .