The first decision a researcher must make is whether to test a group of people at a single moment in time or whether to test a group of people several times, across many days, weeks or even years. Imagine you need to make this decision. What are the pros and cons of each choice?
Objective : To investigate the influence of hospital teaching status and service availability on rates of revascularization following myocardial infarction... JL Cox,E Chen,CD Naylor - 《Journal of General Internal Medicine》 被引量: 885发表: 1994年 Brain fuel metabolism, aging, and Alzheimer's di...
In Wireless Communication, fading refers tothe attenuation of the transmitted signal power due to various variables during wireless propagation. ... Fading can cause decline in performance in a wireless communication system because it results in the loss of signal power thus reducing the Signal to N...
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Setting-Inpatient medical wards Department of Medicine University Teaching Hospital Lusaka Zambia. Objective-- To define the natural history clinical prese... Mwaba,P - 《Postgraduate Medical Journal》 被引量: 381发表: 2001年 Prospective, randomized, double-blind, multi-center, Phase III clinical ...