@article{Frijters2011,
author = {Frijters, P. and Haisken-DeNew, J.P. and Shields, M.A.},
title= {The Increasingly Mixed Proportional Hazard Model: An Application to Socioeconomic Status, Health Shocks, and Mortality},
year = {2011},
doi = {10.1198/jbes.2010.08082},
journal = {Journal of Business & Economic Statistics},
volume = {29},
number = {2},
pages = {271--281},
}