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Analyses for most of the studies described in this section should be fairly straightforward. For instance, repeated measures of analyses of variance could be used to identify significant main effects associated with the various types of products or stimuli used, and product X repeated measures interactions could be used to determine if products differ in their patterns of change over repeated exposures. Moreover, analyses could be conducted with repeated exposures within sessions crossed with days (or sessions) in order to examine if changes within sessions vary as a function of number of days of exposure or some feature of days (e.g., amount of deprivation preceding a day). Instead of analysis of variance, growth curve modeling (e.g., via hierarchical linear modeling) could be used to estimate intercepts and trajectories and to model days as second-level variables. Appropriate covariates might include gender, starting CO or nicotine level, and dependence. In addition, interaction terms could test whether effects differ significantly as a function of any special subpopulations (e.g., those high versus low in dependence). In all such analyses, the normal analytic considerations pertain such as examining and adjusting scores for distributional deviations, missingness, and autocorrelation.
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