Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Patient Recruitment Using Electronic Health Records Under Selection
  Bias: a Two-phase Sampling Framework   Electronic health records (EHRs) are increasingly recognized as a
cost-effective resource for patient recruitment for health research. Suppose we
want to conduct a study to estimate the mean or mean difference of an expensive
outcome in a target population. Inexpensive auxiliary covariates predictive of
the outcome may often be available in patients' health records, presenting an
opportunity to recruit patients selectively and estimate the mean outcome
efficiently. In this paper, we propose a two-phase sampling design that
leverages available information on auxiliary covariates in EHR data. A key
challenge in using EHR data for multi-phase sampling is the potential selection
bias, because EHR data are not necessarily representative of the target
population. Extending existing literature on two-phase sampling designs, we
derive an optimal two-phase sampling method that improves efficiency over
random sampling while accounting for the potential selection bias in EHR data.
We demonstrate the efficiency gain of our sampling design by conducting finite
sample simulation studies and an application study based on data from the
Michigan Genomics Initiative.

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The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat