Supplementary Materials: Modeling social interaction dynamics measured with smartphone sensors: An ambulatory assessment study on social interactions and loneliness

These Supplementary Materials provide additional analyses for the publication "Modeling social interaction dynamics measured with smartphone sensors: An ambulatory assessment study on social interactions and loneliness". In addition to robustness analyses and a post-hoc power analysis, this document also describes an analysis in which we examined how frequency and duration of social interactions predict changes in loneliness. Thirty-six students responded to the UCLA loneliness scale at T1 and T2 (ten weeks later), covering the subscales of intimate, relational, and collective loneliness. Between those assessments, social interactions were measured using social sensors on students' smartphones for a period of 10 weeks. In predicting changes in loneliness subscales (T1-T2), only the mean duration of social interactions was negatively associated with collective loneliness. Future studies should examine these relations in larger samples. Despite the small sample size of this exploratory analysis, it is one of the first to study how social interaction dynamics are associated with changes in loneliness.