search for: zc1b

...levels - every respondent has to answer 4 different choice sets (drawn randomly or systematically from the full factorial) - only the first choice is observed The data frame ('example') would look like this (brand attribute is effect coded): resp y1 y2 y3 za1M za1B za2 zb1M zb1B zb2 zc1M zc1B zc2 A 1 0 0 1 0 50 0 1 50 -1 -1 50 A 1 0 0 1 0 50 0 1 100 -1 -1 100 A 1 0 0 1 0 50 0 1 150 -1 -1 150 A 0 1 0 1 0 200 0 1 50 -1 -1 200 B 0 0 1 1 0 100 0 1 100 -1 -1 50 ... Notation: - resp respondent id - y1, y2, y3 choice indicator for the three alternatives - za1M and za1B effects coded variable...