Conditional correlation

Xem 1-20 trên 30 kết quả Conditional correlation
  • Under explicit diophantine conditions on (α, β) ∈ R2 , we prove that the local two-point correlations of the sequence given by the values (m − α)2 + (n−β)2 , with (m, n) ∈ Z2 , are those of a Poisson process. This partly confirms a conjecture of Berry and Tabor [2] on spectral statistics of quantized integrable systems, and also establishes a particular case of the quantitative version of the Oppenheim conjecture for inhomogeneous quadratic forms of signature (2,2). The proof uses theta sums and Ratner’s classification of measures invariant under unipotent flows. ...

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  • Modern western societies have a paradoxical relationship with risks. On the one hand, there is the utopian quest for a zero-risk society. On the other hand, human activities may increase risks of all kinds, from collaterals of new technologies to global impacts on the planet. The characteristic multiplication of major risks in modern society and its reflexive impact on its development is at the core of the concept of the “Risk Society”

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  • Earthquake Damage to Bridges 34.1 34.2 34.3 34.4 34.5 34.6 Introduction Effects of Site Conditions Correlation of Damage with Construction Era Effects of Changes in Condition Effects of Structural Configuration Unseating at Expansion Joints Bridges with Short Seats and Simple Spans • Skewed Bridges • Curved Bridges • Hinge Restrainers 34 Jack P. Moehle University of California, Berkeley 34.7 34.8 34.9 Damage to Superstructures Damage to Bearings Damage to Substructures Columns • Beams • Joints • Abutments • Foundations • Approaches Marc O.

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  • To better understand the international perspective of public policies for the elderly, in line with the parameters that serve as tendencies for national policies, one must contextualize international health conferences that had health promotion as their central topic. Since the Declaration of Alma-Ata, in 1978(5), it has been noted that measures and characteristics of health promotion imply a search for healthier life styles and active aging. Health promotion is seen as a process of community qualification, aiming to improve life and health conditions.

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  • This book had its origin over 30 years ago, when it became apparent to Jack Cohen that there were relationships between multiple regression and correlation (MRC) on the one hand and the analysis of variance (ANOVA) on the other which were undreamed of (or at least did not appear) in the standard textbooks with which he was familiar. On the contrary, the texts of the era treated MRC and ANOVA as wholly distinct systems of data analysis intended for types of research that differed fundamentally in design, goals, and types of variables.

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  • By the nature of the work they undertake abroad, women may be particularly vulnerable. 11 To a greater degree than men, women tend to face harder and more precarious conditions in receiving countries, especially if they are illiterate, unfamiliar with customs and language in the host country, and lack any marketable skills. Gender is also a key factor when considering the likelihood of remittances being sent and received.

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  • G-rich GT oligonucleotides with a different content of G clusters have been evaluated for their ability to exert cytotoxicity and to bind to nuclear-associated proteins in T-lymphoblast CCRF-CEM cells. Only the oligomers that did not form G-based structures or had a poor structure, under physiological conditions, were able to exert significant cellular growth inhibition effect.

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  • Although pregnancy is considered a normal state, it is a vulnerable period in a woman's life because of exposure to a series of physical, mental, and socially adverse conditions. The earlier these conditions are recognized and addressed, the greater the chances of minimizing their impact. Addressing psychological distress during the perinatal period in an appropriate way makes circumstances better for the woman and her baby in the contexts in which they are living. Health workers attitudes and behaviours are of fundamental importance to promoting mental health.

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  • Preventing disease requires more than providing people with information to make healthy choices. While knowledge is critical, communities must reinforce and support health, for example, by making healthy choices easy and affordable.

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  • Understanding the relationship between credit and interest rate risk is critical to many applications in finance, from valuation of credit and interest rate-sensitive instruments to risk management. This study empirically examines the relationship between interest rates and default risk using firm level corporate default data in the United States between 1982 and 2008. We find significant negative contemporaneous correlations between the changes in short interest rates and aggregate default rates, with a particularly strong relationship around financial crises.

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  • Overview In this chapter we study the structures and properties of orthogonal and pseudoorthogonal sequences. Firstly, we examine several types of pseudo-orthogonal (PN) and Quasi-Orthogonal (QO) sequences, and present their cross-correlation properties under synchronous and asynchronous conditions. Secondly, we survey basic methods of constructing orthogonal code sets. Orthogonal binary (Hadamard) codes may exist for lengths 1, 2 and 4k (for k = 1, 2, 3, ...). Methods for generating all lengths up to 256 are presented...

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  • Recently the phenomenon of network traf®c self-similarity has received signi®cant attention in the networking community [10]. Asymptotic self-similarity refers to the condition in which a time series's autocorrelation function declines like a power law, leading to positive correlations among widely separated observations. Thus the fact that network traf®c often shows self-similarity means that it shows noticeable bursts at a wide range of time scalesÐtypically at least four or ®ve orders of magnitude. ...

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  • Hootkani et al. Journal of Orthopaedic Surgery and Research 2010, 5:41 http://www.josr-online.com/content/5/1/41 CASE REPORT Case report Open Access Neglected simultaneous bilateral femoral neck fractures secondary to narcotic drug abuse treated by bilateral one-staged hemiarthroplasty: a case report Alireza Hootkani, Ali Moradi and Ehsan Vahedi* Abstract Simultaneous bilateral femoral neck fractures are extremely rare and associated with various conditions.

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  • In summary, a long series of studies have investigated the relationship between income and pollution as defined by the Environmental Kutznets Curve. Papers by Grossman and Krueger (1991), Shafik and Bandyopadhyay (1992) and Selden and Song (1994) presented evidence that some pollutants have historically followed an inverted U-curve with respect to income. Although these and other empirical studies point to a correlation between income and pollution, the causal relation is not observed for all sets of data.

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  • Spreading Sequences Overview In this chapter we study the structures and properties of orthogonal and pseudoorthogonal sequences. Firstly, we examine several types of pseudo-orthogonal (PN) and Quasi-Orthogonal (QO) sequences, and present their cross-correlation properties under synchronous and asynchronous conditions. Secondly, we survey basic methods of constructing orthogonal code sets. Orthogonal binary (Hadamard) codes may exist for lengths 1, 2 and 4k (for k = 1, 2, 3, ...). Methods for generating all lengths up to 256 are presented.

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  • Rest and activity in vegetative buds of trees P. Champagnat rue Laboratoire de Phytomorphog6n6se, Universite Blaise-Pascal, 4, Ferrand, France Ledru, F-63000, Clermont- Introduction Rest of buds, particularly on trees or shrubs, may have 3 different origins: 1) unfavorable environmental conditions (for instance low temperatures); in this case, the bud is called ’quiescent’; 2) correlative inhibitions exerted by other organs or parts of the plant, more or less distant from the considered bud.

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  • Digital signal processing is currently in a period of rapid growth caused by recent advances inVLSI technology. This is especially true of three areas of optimum signal pro- cessing; namely, real-time adaptive signal processing, eigenvector methods of spectrum estimation, and parallel processor implementations of optimum filtering and prediction algorithms. In this edition the book has been brought up to date by increasing the emphasis on the above areas and including several new developments.

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  • Hyponatremia in the setting of ECF volume expansion is usually associated with edematous states, such as congestive heart failure, hepatic cirrhosis, and the nephrotic syndrome. These disorders all have in common a decreased effective circulating arterial volume, leading to increased thirst and increased AVP levels. Additional factors impairing the excretion of solute-free water include a reduced GFR, decreased delivery of ultrafiltrate to the diluting site (due to increased proximal fractional reabsorption of Na+ and water), and diuretic therapy.

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  • Prevention of Gastrointestinal Illness Diarrhea, the leading cause of illness in travelers (Chap. 122), is usually a short-lived, self-limited condition; however, 40% of affected individuals need to alter their scheduled activities, and another 20% are confined to bed. The most important determinant of risk is the destination. Incidence rates per 2-week stay have been reported to be as low as 8% in industrialized countries and as high as 55% in parts of Africa, Central and South America, and Southeast Asia. Infants and young adults are at particularly high risk.

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  • Diagnosis of acute pediatric sinusitis must be made on the basis of signs, symptoms, and clinical examination. Laboratory tests may be normal even in complicated sinusitis (Pitkäranta et al. 1999; Hytönen et al. 2000), and radiolog- ical fi ndings do not necessarily correlate with a child’s clinical condition. Pathological fi ndings are frequently found in plain radiographs, CT, and MRI of children with common colds, and also in children without symptoms of a respi- ratory infection (Kronemer and McAlister 1997; American Academy of Pediatrics 2001; Schwartz et al.

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