how many pre- and post-treatment measurements will be made in the study acva how many pre pre treatment measures why a cross-over design cannot take advantage of pre treatment measures? how many pretreatment and post treatment measurements for each subject pre treatment data used for crossover design how many pretreatment measures in treatment what kind of model would a pretreatment study have what is the role of pre treatment what model does pre treatment data use what is the purpose of a cross over design study how many pre treatments and post treatment measurements should be used for a cross design design how many data are needed for the pretreatment design what is the difference between anabova and pretreatment data how many pre-treatment tests for a control group? when are pre pre treatment measurements used how many pre treatment measurements how much pre treatment measurement in crossover design why would we use anabova data for pre treatment data which model uses pre treatment data? what model should take advantage of pre treatment data to design a control study?