Abstract：
PURPOSE:In prospective cohort studies, incidence is typically estimated by the ratio of the observed number of events to person-time at risk. This crude estimator is consistent for the true population incidence rate (IR) under mild assumptions. Here we consider a different setting where only cross-sectional data are available, that is, at a single time point, participants are evaluated to identify whether they have previously had the event of interest. METHODS:Unlike the prospective cohort data setting, for cross-sectional data, the crude IR estimator is biased. Instead, the maximum likelihood estimator (MLE) may be used. Although the MLE does not have a simple closed form, it is consistent and easy to compute using statistical software. To compare the bias of the MLE and the crude estimator, a simulation was conducted. RESULTS:The crude estimator underestimated the true incidence, whereas the MLE was approximately unbiased. In general, bias of the crude estimator tended to be roughly one to two orders of magnitude larger (in absolute value) than the MLE. CONCLUSIONS:Under cross-sectional data with exact event times unknown, the MLE of the IR is straightforward to calculate, more accurate than the crude IR estimator, and consistent provided the hazard is constant.
journal_name
Ann Epidemioljournal_title
Annals of epidemiologyauthors
DeMonte JB,Neilan AM,Loop MS,Ciaranello AL,Hudgens MGdoi
10.1016/j.annepidem.2020.06.005subject
Has Abstractpub_date
2021-01-01 00:00:00pages
106-108.e1eissn
1047-2797issn
1873-2585pii
S1047-2797(20)30202-7journal_volume
53pub_type
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