The three participation levels were based on whether a researcher had completed the following three activities: maintained a RIMS profile, answered questions, and endorsed researchers (see Fig 1). We examined the motivations researchers might have for completing each of the three activities and how they prioritized those motivations. To identify researchers’ motivations for each activity, we presented questions consisting of multiple motivation or attitude statements and asked them to indicate their agreement with each statement on a 7-point Likert scale ranging from strongly agree to strongly disagree. The study used a dimension reduction technique, factor analysis, to identify their underlying motivational structures for each of the three activities. The identified factors and factor-based models were then used to develop factor-based summated scales of motivations. That is, each scale was composed of the question items that significantly loaded on a factor. Finally, ordered logistic regression was used to identify researchers’ value structure or priorities for the motivation scales for each of the activities.