Results 261 to 270 of about 214,379 (306)

Alcohol and injury. A case-crossover study

Archives of Family Medicine, 1995
To determine whether and to what extent alcohol consumption increases the risk of injury.The case-crossover study is a new research design for assessing rare acute events (such as trauma) in relation to intermittent exposures (such as alcohol use) that have transient effects.
D C, Vinson, N, Mabe, L L, Leonard, J, Alexander, J, Becker, J, Boyer, J, Moll   +6 more
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Crossover and Parallel Study of Oral Analgesics

The Journal of Clinical Pharmacology, 1981
Abstract: Ten years ago, analgesics were studied using crossover designs. In recent years, analgesics have been studied only in parallel designs primarily because biostatisticians do not like crossover studies. The advantages of crossover studies are numerous: (1) patients serve as their own control; (2) there is less variability of responses among ...
R I, Wang, E, Waite
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A preliminary study of crowding with biased crossover

Proceedings of the 15th annual conference companion on Genetic and evolutionary computation, 2013
This paper proposes a novel crowding method, which is called "Crowding with Biased Crossover (CBX)". The Biased crossover operator begins with two parents. Then two offspring individuals are created, each offspring taking more characteristics from one of the two parents.
Shigeyoshi Tsutsui, Noriyuki Fujimoto
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A Case-Crossover Study of Sleep and Childhood Injury

Pediatrics, 2001
Objective.To evaluate the association between sleep and wakefulness duration and childhood unintentional injury.Study Design.Case-crossover study.Methods.Two hundred ninety-two injured children who presented at the Children's Emergency Center of Udine, Italy, or their parents were interviewed after a structured questionnaire.
VALENT, Francesca, BRUSAFERRO, Silvio, BARBONE, Fabio   +2 more
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Crossover Studies with Continuous Variables: Power Analysis

American Journal of Therapeutics, 2002
The crossover design is a sensitive means of determining the efficacy of new drugs because it eliminates between-subject variability. However, if the response in the first period carries on into the second (carryover effect) or if time factors cannot be kept constant in a lengthy crossover (time effects), its statistical power may be jeopardized.
Cleophas, T. J. M., Zwinderman, A. H.
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Angled transscleral intravitreal injection: a crossover study

European Journal of Ophthalmology, 2014
Purpose The perfect intravitreal injection delivers an exact amount of medication with the least risk to vision and the eye. We examined 2 different methods of intravitreal injection to determine if an angled transscleral entry for intravitreal injection results in less egress of intravitreal contents, including
Mitul C, Mehta, Paul T, Finger
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Testing Crossover Studies for Carryover Effects

Angiology, 1989
For the study of cardiovascular disease, for instance, hypertension and angina pectoris, properly de signed crossover studies are to be preferred over parallel-design stud ies. Many statisticians now propose that these studies should always be tested for carryover effects.
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STUDY IN CROSSOVER FRIES MIGRATION

Organic Preparations and Procedures International, 1992
(1992). STUDY IN CROSSOVER FRIES MIGRATION. Organic Preparations and Procedures International: Vol. 24, No. 6, pp. 687-690.
R. N. Khanna, K. P. Singh, Jyotsana Sharma   +2 more
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A study of crossover operators in genetic programming

1991
Holland's analysis of the sources of power of genetic algorithms has served as guidance for the applications of genetic algorithms for more than 15 years. The technique of applying a recombination operator (crossover) to a population of individuals is a key to that power. Neverless, there have been a number of contradictory results concerning crossover
William M. Spears, Vic Anand
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Crossover Studies with Binary Responses

2011
The two-period crossover trial has the evident advantage that by the use of within-patients comparisons, the usually larger between-patient variability is not used as a measuring stick to compare treatments. However, a prerequisite is that the order of the treatments does not substantially influence the outcome of the treatment.
Ton J. Cleophas, Aeilko H. Zwinderman
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