Inter- and intra-individual sources of variation in levels of urinary styrene metabolites

2001 ◽  
Vol 74 (5) ◽  
pp. 336-344 ◽  
Author(s):  
Elaine Symanski ◽  
Enrico Bergamaschi ◽  
Antonio Mutti
Keyword(s):  
Sources Of Variation ◽  
Styrene Metabolites

Genetic Sources of Variation in the Gestation Length of the Horse

1951 ◽  
Vol 10 (4) ◽  
pp. 797-806 ◽  
Author(s):  
W. C. Rollins ◽  
C. E. Howell
Keyword(s):  
Gestation Length ◽  
Sources Of Variation

It Takes Two to Make an Interview Go Right: Round-Robin Designs to Demonstrate Interviewer and Witness Variance

2018 ◽  
Author(s):  
Charlotte A. Hudson ◽  
Liam Satchell ◽  
Nicole M Adams-Quackenbush
Keyword(s):  
Grain Size ◽  
Individual Differences ◽  
Individual Difference ◽  
Round Robin ◽  
Investigative Interviews ◽  
Sources Of Variation ◽  
Interview Performance ◽  
Report Accuracy ◽  
Statistical Demonstration

Purpose: Investigative interviews are complex, dyadic, activities typically studied by focusing on developing techniques to improve witness performance. However, in field settings, interviewers are known to vary in their presentation of good interviewing practice. Thus, it is important to conduct research reflective of complex idiosyncrasies in witnesses, interviewers and unique pairings of both. This study explores such sources of variation in an by making use of a 'round-robin' design. Such methodology allows the statistical demonstration of individual difference and unique partner-generated variance in interview performance. Methods: In our study, a total of 45 witnesses were questioned about five real crime videos. After witnessing each event, witnesses were interviewed by a different interviewer (or a computer self-administered interview). In total, nine 'rounds' of interviews occurred, with five new witnesses being interviewed in the same five interview settings (resulting in 225 interviews). After each interview both interviewers and witnesses were asked to complete subjective interview experience ratings. The quality (grain size) and quantity of information in the statements was coded to index witness report accuracy. Results: Principally, the results demonstrate the degree to which witnesses and interviewers affect statement quality, and highlight the influence of unique interviewer-witness pairs. (Participant personality and interviewer behaviour were also analysed, but with limited effects). Conclusion: This study presents the useful round-robin methodology for studying interviewer-witness behaviour. Whilst the current personality and behavioural measures do not account for these individual differences, we advocate this methodology be adopted more widely to better understand interview performance.

Still Connecting with Society?

2017 ◽  
Author(s):  
Elin Haugsgjerd Allern ◽  
Tània Verge
Keyword(s):  
Political Parties ◽  
Ethnic Minorities ◽  
Social Groups ◽  
The Public ◽  
Organized Interests ◽  
Social Interests ◽  
Sources Of Variation ◽  
Cross Country ◽  
Formal Status ◽  
Formal Rules

How parties structure their interaction with social groups is a key determinant of their capacity to provide linkage between the institutions of government and the public at large. This chapter investigates the extent to which modern political parties use formal measures to connect to relevant societal interests and strengthen their anchorage in society. The analysis centres on parties’ use of formal rules governing affiliation and representation to link with externally organized interests and parties’ establishment of sub-organizations with representation rights within the party. The chapter authors develop and test several hypotheses concerning cross-country and within-country sources of variation in formal linkage and test them empirically. In addition, they examine whether formal status and representation rights shape parties’ ability to represent descriptively the associated latent social interests focusing on the case of women and ethnic minorities.

scholarly journals Mapping of scatter in fatigue life assessment of welded structures—a round-robin study

2021 ◽  
Author(s):  
Gustav Hultgren ◽  
Mansoor Khurshid ◽  
Peter Haglund ◽  
Zuheir Barsoum
Keyword(s):  
Fatigue Life ◽  
Round Robin ◽  
Life Assessment ◽  
Fatigue Life Assessment ◽  
Fatigue Life Estimation ◽  
Box Structures ◽  
Load Carrying ◽  
Local Stresses ◽  
Sources Of Variation ◽  
Global And Local

AbstractA round-robin study has been carried out within a national project in Sweden with the addition of an international participant, where several industrial partners and universities are participating. The project aims to identify variation and sources of variation in welding production, map scatter in fatigue life estimation, and define and develop concepts to reduce these, in all steps of product development. The participating organisations were asked to carry out fatigue life assessment of welded box structures, which is a component in load-carrying structures. The estimations of fatigue life have also been compared with fatigue test results. Detailed drawings, loads and material data were also given to the participants. The participants were supposed to use assessment methods based on global and local stresses using the design codes or recommendations they currently use in-house. Differences were identified between both methods and participants using the same codes/recommendations. Applicability and conditions from the cases in the codes were also identified to be differently evaluated between the participants. It could be concluded that for the applied cases the nominal stress method often overestimated the fatigue life and had a high scatter in the estimations by different participants. The effective notch method is conservative in comparison to the life of tested components with little scatter between the results derived by the participants.

scholarly journals Sources of variation in bourbon whiskey barrels: a review

2021 ◽  
Author(s):  
Jarrad Gollihue ◽  
Victoria G. Pook ◽  
Seth DeBolt
Keyword(s):  
Sources Of Variation

Establishment of reference intervals for immunoassay analytes of adult population in Saudi Arabia

2020 ◽  
Vol 58 (8) ◽  
pp. 1302-1313 ◽  
Author(s):  
Anwar Borai ◽  
Kiyoshi Ichihara ◽  
Abdulaziz Masaud ◽  
Waleed Tamimi ◽  
Suhad Bahijri ◽  
...  
Keyword(s):  
Vitamin D ◽  
Saudi Arabia ◽  
Adult Population ◽  
Reference Intervals ◽  
Careful Consideration ◽  
Upper Limits ◽  
Sources Of Variation ◽  
Vitamin D Supplements ◽  
Saudi Arabians ◽  
Abbott Architect

AbstractBackgroundThis is a second part of report on the IFCC global multicenter study conducted in Saudi Arabia to derive reference intervals (RIs) for 20 immunoassay analytes including five tumor makers, five reproductive, seven other hormones and three vitamins.MethodsA total of 826 apparently healthy individuals aged ≥18 years were recruited in three clinical laboratories located in western, central and eastern Saudi Arabia using the protocol specified for the global study. All serum specimens were measured using Abbott, Architect analyzers. Multiple regression analysis (MRA) was performed to explore sources of variation of each analyte: age, body mass index (BMI), physical exercise and smoking. The magnitude of variation of reference values (RVs) attributable to sex, age and region was calculated by ANOVA as a standard deviation ratio (SDR). RIs were derived by the parametric (P) method.ResultsMRA revealed that region, smoking and exercise were not relevant sources of variation for any analyte. Based on SDR and actual between-sex differences in upper limits (ULs), we chose to partition RIs by sex for all analytes except for α-fetoprotein and parathyroid hormone (PTH). Age-specific RIs were required in females for ferritin, estradiol, progesterone, testosterone, follitropin, luteotropin and prolactin (PRL). With prominent BMI-related increase, RIs for insulin and C-peptide were derived after excluding individuals with BMI > 32 kg/m2. Individuals taking vitamin D supplements were excluded in deriving RIs for vitamin D and PTH.ConclusionsRIs of major immunoassay analytes specific for Saudi Arabians were established in careful consideration of various biological sources of variation.

SOURCES OF VARIATION IN SECOND AND NATIVE LANGUAGE SPEAKING PROFICIENCY AMONG COLLEGE-AGED SECOND LANGUAGE LEARNERS

2021 ◽  
pp. 1-26
Author(s):  
Mona Roxana Botezatu ◽  
Taomei Guo ◽  
Judith F. Kroll ◽  
Sarah Peterson ◽  
Dalia L. Garcia
Keyword(s):  
Working Memory ◽  
Second Language ◽  
Cognitive Control ◽  
Second Language Learners ◽  
Native Language ◽  
L2 Proficiency ◽  
Speaking Proficiency ◽  
Sources Of Variation ◽  
Internal Sources ◽  
L1 And L2

Abstract We evaluated external and internal sources of variation in second language (L2) and native language (L1) proficiency among college students. One hundred and twelve native-English L2 learners completed measures of L1 and L2 speaking proficiency, working memory, and cognitive control and provided self-ratings of language exposure and use. When considering learner-external variation, we found that more frequent L2 exposure predicted higher L2 and L1 proficiency, while earlier L2 exposure predicted higher L2 proficiency, but poorer L1 maintenance. L1–L2 distance limited crosslinguistic transfer of print-to-sound mappings. When considering learner-internal variation, we found that L1 and L2 proficiency were highly correlated and that better working memory, but not cognitive control, accounted for additional variance in L2 and L1 proficiency. More frequent L2 exposure was associated with better cognitive control.

scholarly journals To Conscience First, and to the Pope (Long) Afterwards? British Catholics and Their Attitudes Towards Morality and Structural Issues Concerning the Catholic Church

2021 ◽  
Author(s):  
Ben Clements ◽  
Stephen Bullivant
Keyword(s):  
Catholic Church ◽  
Religious Commitment ◽  
Roman Catholic ◽  
Religious Community ◽  
Roman Catholic Church ◽  
Personal Morality ◽  
Sources Of Variation ◽  
Nationally Representative ◽  
The Church ◽  
The Catholic Church

Abstract Background The attitudes of Catholics in Britain have undergone significant liberalisation on social moral issues across recent decades, whilst the reputation of the Catholic Church has suffered due to public opposition to its traditional teachings on such issues. But there has been comparatively little recent investigation into British Catholics’ views on these debates using surveys aimed at this religious community. Purpose This article examines the sources of attitudinal heterogeneity amongst Catholics in Britain on core debates affecting the Catholic Church. The aims are to examine, firstly, which groups within the British Catholic Community are more likely to conform to or to dissent from the Church’s teachings and, secondly, whether the socio-demographic and religious correlates of attitudes vary across different types of issue. Methods This article uses a new, nationally representative survey of Catholic adults in Britain (n = 1823). The survey is used to examine the sources of variation in Catholics’ attitudes towards a range of issues relating to the Roman Catholic Church. These issues relate to the priesthood, personal morality, and sinful behaviours. OLS models are used to assesses the relative impact of socio-demographic, religious socialisation, and religious commitment variables. Results The findings show that women are consistently more liberal in their views than men. Greater religious commitment is always associated with support for the traditional teachings of the Church. Conclusions and Implications Exploring the sources of attitudinal heterogeneity among Catholics, we provide new insights into the internal dynamics of ‘Britain’s largest minority’. We conclude by discussing the potential effects of increasing ‘nonversion’ for interpreting religious statistics—a topic of relevance beyond the denominational and geographical confines of this study’s explicit focus.

scholarly journals Sources of variation in the feeding ecology of the piked spurdog (Squalus megalops): implications for inferring predator–prey interactions from overall dietary composition

2005 ◽  
Vol 62 (6) ◽  
pp. 1076-1094 ◽  
Author(s):  
J. Matías Braccini ◽  
Bronwyn M. Gillanders ◽  
Terence I. Walker
Keyword(s):  
Spatial And Temporal Variation ◽  
Dietary Composition ◽  
Bootstrap Analysis ◽  
Predator Prey ◽  
Ecological Relationships ◽  
Wide Range ◽  
Opportunistic Predator ◽  
Sources Of Variation ◽  
Males And Females ◽  
Prey Items

Abstract Sources of variation in dietary composition were examined in the piked spurdog (Squalus megalops). The species is an opportunistic predator that consumes a wide range of prey items. When importance of prey was measured by weight or occurrence, S. megalops preyed largely on molluscs and teleosts. However, when number of prey was considered, the main items were crustaceans. A bootstrap analysis showed that considerable variability can be expected in the importance of prey items in the species' overall diet. Regional, seasonal, and ontogenetic differences in dietary composition were found, but there were no differences between mature and immature sharks or between males and females. The spatial and temporal variation in diet exhibited by S. megalops and the intrinsic natural variability of the dietary composition of this opportunistic predator suggest that studies that infer predator–prey interactions from overall diet are likely to miss information on the ecological relationships among species and thus account for only part of these interactions.

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