LOG-LINEAR APPROACHES TO LAG-SEQUENTIAL ANALYSIS WHEN CONSECUTIVE CODES MAY AND CANNOT REPEAT

G. P. Sackett's (1979) lag-sequential analysis is recast in log-linear terms. Differing from articles by P. D. Allison and J. K. Liker (1982 ) and by D. lacobucci and S. Wasserman (1988), sequences that, for log ical reasons, do not allow consecutive events to be assigned the same code are considered. In addition, overlapped sampling, which the seque ntial analysis literature usually assumes, is contrasted with nonoverl apped sampling of sequences, which is also used and may seem more fait hful to some statistical models. Several advantages of a log-linear ap proach to sequential problems are noted, including its ability to deal routinely with the structural zeros created when consecutive codes ca nnot repeat and its integration of sequential methods into an establis hed and well supported statistical tradition.