How accurate is self-testing?
نویسندگان
چکیده
منابع مشابه
How accurate is self reported birth weight among the elderly?
The eVect of early life influences on adult health is a central topic in current epidemiological research. For instance, growth and development in utero and in infancy have been linked to cardiovascular disease. In empirical research in this field, birth weight is often used as an indicator of health and nutrition in utero. There are two main sources of birthweight data: birth records and the m...
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BACKGROUND Although it is defined as cough and sputum production for at least 3 months per year for at least 2 consecutive years, difficulties exist in the use of the term chronic bronchitis for clinical diagnosis. In particular, the relationship between diagnosis and symptoms has been difficult to ascertain. STUDY OBJECTIVES To determine, in a large epidemiologic study, the degree to which a...
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Born-Oppenheimer dynamics is shown to provide an accurate approximation of time-independent Schrödinger observables for a molecular system with an electron spectral gap, in the limit of large ratio of nuclei and electron masses, without assuming that the nuclei are localized to vanishing domains. The derivation, based on a Hamiltonian system interpretation of the Schrödinger equation and stabil...
متن کاملHow Accurate Is Peer Grading?
Previously we showed that weekly, written, timed, and peer-graded practice exams help increase student performance on written exams and decrease failure rates in an introductory biology course. Here we analyze the accuracy of peer grading, based on a comparison of student scores to those assigned by a professional grader. When students graded practice exams by themselves, they were significantl...
متن کاملHow Accurate is Gaussian Elimination?∗
J.H. Wilkinson put Gaussian elimination (GE) on a sound numerical footing in the 1960s when he showed that with partial pivoting the method is stable in the sense of yielding a small backward error. He also derived bounds proportional to the condition number κ(A) for the forward error ‖x − x̂‖, where x̂ is the computed solution to Ax = b. More recent work has furthered our understanding of GE, la...
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ژورنال
عنوان ژورنال: New Scientist
سال: 2020
ISSN: 0262-4079
DOI: 10.1016/s0262-4079(20)30909-x