منابع مشابه
Clustering Financial Time Series: How Long Is Enough?
Researchers have used from 30 days to several years of daily returns as source data for clustering financial time series based on their correlations. This paper sets up a statistical framework to study the validity of such practices. We first show that clustering correlated random variables from their observed values is statistically consistent. Then, we also give a first empirical answer to th...
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از زمانی که پژوهش‌گران نگارش یک مقاله را به پایان برده و ارسال آن به مجله را در دستور کار خویش قرار می‌دهند، یکی از مهم‌ترین سؤالاتی که ممکن است ذهن آن‌ها را مشغول نماید این است که: " در مجله مورد نظر، چقدر زمان برای فرآیند بررسی و چاپ یک مقاله مورد نیاز است؟" این سوال، به خصوص برای دانشجویان تحصیلات تکمیلی که برای چاپ مقاله خود عجله دارند، از اهمیت بیش‌تری برخوردار است. توصیه شخصی من این است...
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Congenital long QT syndrome (LQTS) affects an estimated 1 in 2500 people and typically presents with syncope, seizures or sudden death. Whereas someone exhibiting marked prolongation of the QT interval with QTc exceeding 500 ms who was just externally defibrillated from torsades de pointes while swimming poses negligible diagnostic challenge as to the unequivocal probability of LQTS, the certai...
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Despite being in publishing for the best part of two decades there is one thing I cannot adequately explain. Why is it that when a journal wants something from an author, the journal gives a deadline of barely a week but when an author wants something from a journal he can seemingly wait for ever? A typical example is when waiting for review. An author spends a year, or more, undertaking a rese...
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In the context of archiving of physical documents, long-term storage has long been accepted to mean centuries. Digital documents are much more ephemeral, so archivists should be aware of the inherent limitations of the technologies available for preservation of digital data. This paper compiles the results of several studies on this subject, in addition to presenting new findings on what can be...
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ژورنال
عنوان ژورنال: Journal of the Royal Society of Medicine
سال: 2000
ISSN: 0141-0768,1758-1095
DOI: 10.1177/014107680009301023