van Buuren S (In preparation). “Broken Stick Model for Irregular Longitudinal Data.” https://github.com/growthcharts/brokenstick.

@Misc{,
  title = {Broken Stick Model for Irregular Longitudinal Data},
  author = {Stef {van Buuren}},
  journal = {Journal of Statistical Software},
  year = {In preparation},
  url = {https://github.com/growthcharts/brokenstick},
}