Estimating average annual per cent change in trend analysis

@article{Clegg2009EstimatingAA,
  title={Estimating average annual per cent change in trend analysis},
  author={Limin X. Clegg and Benjamin F. Hankey and Ram C. Tiwari and Eric J. Feuer and Brenda K. Edwards},
  journal={Statistics in Medicine},
  year={2009},
  volume={28},
  pages={3670 - 3682}
}
Trends in incidence or mortality rates over a specified time interval are usually described by the conventional annual per cent change (cAPC), under the assumption of a constant rate of change. When this assumption does not hold over the entire time interval, the trend may be characterized using the annual per cent changes from segmented analysis (sAPCs). This approach assumes that the change in rates is constant over each time partition defined by the transition points, but varies among… 

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