Results 251 to 260 of about 11,105,784 (304)
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On the Performance of a Test for Coefficient of Variation
Calcutta Statistical Association Bulletin, 1992Approximate standard errors (s.e) of sample coefficient of variation (c.v.) are available in the literature (Kendall and Stuart, 1977; Serfting 1980). Using these s.e.'s a large sample test can be constructed to test for the specified value of population c.v. The test can also be justified on the principles of Wald test.
Aruna Rao, K., Vidya, R.
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Variations in hyperacuity performance with age
Noninvasive Assessment of the Visual System, 1991A recent study (Odom et. al., 1989) has suggested that the vernier acuity of an observer is independent of the individual's age. This is somewhat surprising given the evidence of an age-related decline in other measures of visual performance such as visual acuity, contrast sensitivity (Elliott, Whitaker and MacVeigh, 1990) and indeed other types of ...
D, Whitaker, D B, Elliott, D, MacVeigh
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Meaningful Variation in Performance
Medical Care, 2010Recommendations for directing quality improvement initiatives at particular levels (eg, patients, physicians, provider groups) have been made on the basis of empirical components of variance analyses of performance.To review the literature on use of multilevel analyses of variability in quality.Systematic literature review of English-language articles (
Vicki, Fung +7 more
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Individual pay-for-performance and performance variation
2023Performance variation, which refers to the extent to which one’s performance deviates from its overall level and trend, has been a crucial but long ignored aspect of employees’ dynamic performance profile. In this dissertation, I propose a theoretical model that relates an organization’s compensation practice—individual pay-for-performance (PFP ...
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Time of day variations in driving performance
Accident Analysis & Prevention, 1997Numerous factors may contribute to the 24-hour pattern of automobile accidents. One factor may be a time of day variation in driving ability. In the present study, 11 male subjects operated a driving simulator for 30 minutes at six times of day. Subjects were instructed to maintain a stable position in the left-hand lane and to drive at a constant ...
M G, Lenné, T J, Triggs, J R, Redman
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Variations in the Performance of Hip Fracture Procedures
Medical Care, 1997Hip replacement is the preferred treatment for displaced femoral neck fractures, whereas other less expensive procedures are preferred for nondisplaced fractures. The authors determined whether there was geographic variation in the use of hip replacement to treat displaced and nondisplaced fractures.The authors studied 332 patients, age 65 years or ...
Burns, Risa B. +5 more
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Performance variation across benchmark suites
ACM SIGARCH Computer Architecture News, 1990The performance ratio between two systems tends to vary across different benchmarks. Here we study this variation as a "signature" or "fingerprint" of the systems under consideration. This "fingerprint" can be used to guess the performance of programs not represented in a benchmark suite, assess the breadth and credibility of the benchmark suite, and ...
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Interindividual Variation in Human Visual Performance
Journal of Cognitive Neuroscience, 1999Abstract The responses of 20 young adult emmetropes with normal color vision were measured on a battery of visual performance tasks. Using previously documented tests of known reliability, we evaluated orientation discrimination, contrast sensitivity, wavelength sensitivity, vernier acuity, direction-of-motion detection, velocity ...
S D, Halpern, T J, Andrews, D, Purves
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Computer comparisons in the presence of performance variation
Frontiers of Computer Science, 2018Performance variability, stemming from non-deterministic hardware and software behaviors or deterministic behaviors such as measurement bias, is a well-known phenomenon of computer systems which increases the difficulty of comparing computer performance metrics and is slated to become even more of a concern as interest in Big Data analytic increases ...
Samuel Irving +5 more
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Cyclic variations in sustained human performance
Brain and Cognition, 2009Biological rhythms play a prominent role in the modulation of human physiology and behavior. [Smith, K., Valentino, D., & Arruda, J. (2003). Rhythmic oscillations in the performance of a sustained attention task. Journal of Clinical and Experimental Neuropsychology, 25, 561-570] suggested that sustained human performance may systematically fluctuate in
William R, Aue +3 more
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