@article{Singer1993,
author = {Singer, J.D. and Willett, J.B.},
title= {It’s about time: Using discrete-time survival analysis to study duration and the timing of events},
year = {1993},
doi = {10.3102/10769986018002155},
URL = {https://doi.org/10.3102/10769986018002155},
volume = {18},
number = {2},
pages = {155195},
}