# Can Smartphone Co-locations Detect Friendship? It Depends How You Model It

arXiv: https://arxiv.org/abs/2008.02919 · HTML: https://mlsanity.com/paper/2008.02919/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 7 Aug 2020.

## Built on by (most cited first, 1 of 1)

- [Self-supervised Pretraining and Transfer Learning Enable Flu and COVID-19 Predictions in Small Mobile Sensing Datasets](https://mlsanity.com/paper/2205.13607/) (2022)

## Abstract (arXiv)

We present a study to detect friendship, its strength, and its change from smartphone location data collectedamong members of a fraternity. We extract a rich set of co-location features and build classifiers that detectfriendships and close friendship at 30% above a random baseline. We design cross-validation schema to testour model performance in specific application settings, finding it robust to seeing new dyads and to temporalvariance.