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Oscillation and variation for the Hilbert transform
It is well known that this limit exists a.e. for all f ∈ L, 1 ≤ p < ∞. In this paper, we will consider the oscillation and variation of this family of operators as goes to zero, which gives extra… Expand
A Brief Risk Stratification Tool to Predict Functional Decline in Older Adults Discharged from Emergency Departments
- F. Hustey, L. Mion, J. Connor, C. Emerman, J. Campbell, R. Palmer
- Journal of the American Geriatrics Society
- 1 August 2007
OBJECTIVES: To determine the effectiveness of the six‐item Triage Risk Screening Tool (TRST) to assess baseline functional status and predict subsequent functional decline in older community‐dwelling… Expand
The Poisson Correlation Function
- J. Campbell
- 1 March 1934
In this study, the use of factorial moments and factorial moment generating functions as applied (2) to the Poisson frequency function and Charlier's Type B function is further extended towards… Expand
Oscillation and variation for singular integrals in higher dimensions
In this paper we continue our investigations of square function inequalities in harmonic analysis. Here we investigate oscillation and variation inequalities for singular integral operators in… Expand
Resource use data by patient report or hospital records: Do they agree?
- A. D. Kennedy, Anne P Leigh-Brown, D. Torgerson, J. Campbell, A. Grant
- BMC health services research
- 17 January 2002
BackgroundEconomic evaluations alongside clinical trials are becoming increasingly common. Cost data are often collected through the use of postal questionnaires; however, the accuracy of this method… Expand
When are two elements of GL(2,Z) similar?
We give an algorithm which determines conjugacy in GL(2,Z), thus determining the topological conjugacy of the corresponding toral automorphisms.
The spectral measure and Hilbert transform of a measure-preserving transformation
On demontre que des operateurs unitaires qui proviennent de transformations conservant la mesure satisfont une version plus forte de la condition de V. F. Gaposhkin sur la mesure spectrale d'une… Expand
On some classes of weighted composition operators
Known regularity conditions (given below) are both necessary and sufficient for the linear transformation/—* WTf to define a bounded operator on L ((i); such operators are called weighted composition… Expand
Associations between Stroke Mortality and Weekend Working by Stroke Specialist Physicians and Registered Nurses: Prospective Multicentre Cohort Study
In a multicenter observational study, Benjamin Bray and colleagues evaluate whether weekend rounds by stroke specialist physicians, or the ratio of registered nurses to beds on weekends, is… Expand
The Effect of Out of Hours Presentation with Acute Stroke on Processes of Care and Outcomes: Analysis of Data from the Stroke Improvement National Audit Programme (SINAP)
- J. Campbell, B. Bray, A. Hoffman, Sara J. Kavanagh, A. Rudd, P. Tyrrell
- PloS one
- 12 February 2014
Background There is inconsistent evidence that patients with stroke admitted to hospital out of regular working hours (such as weekends) experience worse outcomes. We aimed to identify if… Expand