Results 21 to 30 of about 873,763 (308)

Minimum variance stratification of a finite population

, 2003
This paper considers the combined problem of allocation and stratification in order to minimise the variance of the expansion estimator of a total, taking into account that the population is finite.
Hedlin, Dan
core   +2 more sources

A Statistical Model for Risk Stratification on the Basis of Left Ventricular Ejection Fraction and Heart-Rate Turbulence [PDF]

, 2000
The MPIP data set was used to obtain a model for mortality risk stratification of acute myocardial infarction patients. The predictors heart rate turbulence (HRT) and left-ventricular ejection fraction (LVEF) were employed. HRT was a categorical variable
Pashova, Victoria, Rolnitzky, Linda, Barthel, Petra, Schneider, Raphael, Schömig, Albert, Schmidt, Georg, Bigger Jr., J. Thomas, Ulm, Kurt   +7 more
core   +1 more source

Current and past peer victimization and school belonging: the moderating role of teacher, peer, and family support

International Journal of Adolescence and Youth
Grounded in a socio-ecological perspective, this study examines how peer victimization experiences during the middle-to-high school transition relate to adolescents’ sense of school belonging and whether support from teachers, peers, and family moderates
Katarína Aslan, Aleš Kudrnáč
doaj   +1 more source

An influence of abiotic factors on the germinability of Agrostis species and Poa species

Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2006
The objective of this contribution is to interpret the impact of some abiotic factors on the germinability. Primarily was observed the stress that they cause on germinability and also on the energy of other perennial grass caryopsis' germinability ...
Pavel Knot
doaj   +1 more source

Herpesviruses Serology Distinguishes Different Subgroups of Patients From the United Kingdom Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Biobank

Frontiers in Medicine, 2021
The evidence of an association between Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) and chronic herpesviruses infections remains inconclusive.
Tiago Dias Domingues, Tiago Dias Domingues, Anna D. Grabowska, Ji-Sook Lee, Jose Ameijeiras-Alonso, Francisco Westermeier, Francisco Westermeier, Carmen Scheibenbogen, Jacqueline M. Cliff, Luis Nacul, Luis Nacul, Eliana M. Lacerda, Helena Mouriño, Helena Mouriño, Nuno Sepúlveda, Nuno Sepúlveda, Nuno Sepúlveda   +16 more
doaj   +1 more source

Diazotrophic Cyanobacteria are Associated With a Low Nitrate Resupply to Surface Waters in Lake Tanganyika

Frontiers in Environmental Science, 2021
In Lake Tanganyika, blooms of nitrogen-fixing (diazotrophic) cyanobacteria emerge, when the upper water column re-stratifies after a period of upwelling and convective mixing.
Benedikt Ehrenfels, Benedikt Ehrenfels, Maciej Bartosiewicz, Maciej Bartosiewicz, Athanasio Stephano Mbonde, Kathrin B.L. Baumann, Kathrin B.L. Baumann, Christian Dinkel, Julian Junker, Julian Junker, Tumaini M. Kamulali, Ismael A. Kimirei, Ismael A. Kimirei, Robert Niederdorfer, Daniel Odermatt, Francesco Pomati, Emmanuel A. Sweke, Emmanuel A. Sweke, Bernhard Wehrli, Bernhard Wehrli   +19 more
doaj   +1 more source

Allocation Constraints in Stratification [PDF]

Communications in Statistics - Simulation and Computation, 2008
When a finite population is to be stratified, one of constraints in stratification is that sample sizes from strata may not be greater than the corresponding strata sizes and may not be smaller than two. There are several ways of treating this allocation constraint, each providing an alternative approach to stratification. In the paper it is shown that
Marcin Kozak, Pawel Jankowski
openaire   +1 more source

Central Nervous System Tumors Among Infants in Canada: A Report From CYP‐C

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Central nervous system (CNS) tumors in infants are rare, pose unique clinical challenges, and lack large‐scale evidence‐based data to guide management. This study seeks to describe CNS tumors in Canadian infants and to compare their outcomes with those of older children.
Samuel Sassine, Hallie Coltin, Sylvia Cheng, Lucie Lafay‐Cousin, Vanan Issai Magimairajan, Craig Erker, Stéphanie Vairy, Lynette Bowes, Adam Fleming, Donna Johnston, Sarah McKillop, Roona Sinha, Julie Bennett, Christina Coleman, Laura Wheaton, Shayna Zelcer, Samuele Renzi, Thai Hoa Tran   +17 more
wiley   +1 more source

Classifying social position with social media behavioral data

EPJ Data Science
The main question of our study is how far social position can be predicted solely based on digital behavior. The phenomenon that offline inequalities are reflected in the digital space has been heavily researched since the digital revolution ...
Júlia Koltai, Zsófia Rakovics, Zoltán Kmetty, Kata Számel, Borbála Ungvári, Bendegúz Váradi, Ákos Huszár   +6 more
doaj   +1 more source

Species Diversity and Molecular Screening of Pyrethroid Resistance Mediated by the Voltage-Gated Sodium Channel in Ixodid Ticks from Puducherry, India

Pathogens
Ticks are major ectoparasites of livestock in India, causing substantial economic losses and transmitting a wide range of pathogens. Control strategies rely heavily on synthetic pyrethroid acaricides; however, resistance associated with mutations in the ...
Kaja Hussain Jasmiminal, Elango Ayyanar, Chakravarthi Madda, Vignesh Kumar Ramakrishnan, Hari Kishan Raju Konuganti, Manju Rahi   +5 more
doaj   +1 more source