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Further Properties of Reproducing Graphs  [PDF]
Jonathan Jordan, Richard Southwell
Applied Mathematics (AM) , 2010, DOI: 10.4236/am.2010.15045
Abstract: Many real world networks grow because their elements get replicated. Previously Southwell and Cannings introduced a class of models within which networks change because the vertices within them reproduce. This happens deterministically so each vertex simultaneously produces an offspring every update. These offspring could represent individuals, companies, proteins or websites. The connections given to these offspring depend upon their parent’s connectivity much as a child is likely to interact with their parent’s friends or a new website may copy the links of pre-existing one. In this paper we further investigate one particular model, ‘model 3’, where offspring connect to their parent and parent’s neighbours. This model has some particularly interesting features, including a degree distribution with an interesting fractal-like form, and was introduced independently under the name Iterated Local Transitivity by Bonato et al. In particular we show connections between this degree distribution and the theory of integer partitions and show that this can be used to explain some of the features of the degree distribution; we give exact formulae for the number of complete subgraphs and the global clustering coefficient and we show how to calculate the minimal cycle basis.
A Comparative Analysis of MMPI and Rorschach Findings Assessing Combat-Related PTSD in Vietnam Veterans—Analysis of MMPI and Rorschach Findings Assessing PTSD  [PDF]
Ioanna Katsounari, Jordan Jacobowitz
Psychology (PSYCH) , 2011, DOI: 10.4236/psych.2011.24053
Abstract: There has been a proliferation of assessment research on Post-traumatic Stress Disorder (PTSD) over the past twenty years. In spite of recent advances in the PTSD assessment research, there continues to be a controversy as to whether the MMPI or Rorschach is more useful in determining the presence of PTSD. The present comparative analysis of the research literature will carefully evaluate controlled empirical studies, which utilized psychometric measures such as the MMPI/2 and Rorschach to identify PTSD in Vietnam Veterans. This analysis is guided by the paucity of comparative data for standardized objective and projective instruments to assess combat-related PTSD. The analysis indicated that the MMPI as an assessment instrument focuses on symptom recognition of PTSD while the Rorschach seems to be more likely to identify chronic adaptations to trauma. The significance of pre-combat factors, such as preexisting personality, and their impact on the way individuals make meaning and express traumatic experiences needs to be further addressed in future research. The need for reliable and valid measures to assess combat-related PTSD is urgent as an increasing number of soldiers return from war zones.
Maximizing Sampling Efficiency  [PDF]
Harmon S. Jordan
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.411209
Abstract: Background and Goals: Although health care quality improvement has traditionally involved extensive work with paper records, the adoption of health information technology has increased the use of electronic record and administrative systems. Despite these advances, quality improvement practitioners now and for the foreseeable future need guidance in defining populations of individuals for study and in selecting and analyzing sample data from such populations. Statistical data analysis in health care research often involves using samples to make inferences about populations. The investigator needs to consider the goals of the study, whether sampling is to be used, and the type of population being studied. While there are numerous sampling strategies designed to conserve resources and yield accurate results, one of these techniques—use of the finite population correction (FPC)—has received relatively little attention in health care sampling contexts. It is important for health care quality practitioners to be aware of sampling options that may increase accuracy and conserve resources. This article describes common sampling situations in which the issue of the finite population correction decision often arises. Methods: This article describes 3 relevant sampling situations that influence the design and analysis phases of a study and offers guidance for choosing the most effective and efficient design. Situation 1: The study or activity involves taking a sample from a large finite target population for which enumerative inferences are needed. Situation 2: The population is finite and the study is enumerative. A complete enumerative count of “defects” in the process is needed so that remediation can occur. Here, statistical inference is unnecessary. Situation 3: The target population is viewed as infinite; such populations are “conceptual populations” [1] or “processes”. Results: The article shows how savings in resources can be achieved by choosing the correct analytic framework at the conceptualization phase of study design. Choosing the right sampling approach can produce accurate results at lower costs. Several examples are presented and the implications for health services research are discussed. Conclusion: By clearly specifying the objectives of a
Help Not Wanted: The Dismal Science of Youth Unemployment’s Scarring Effect  [PDF]
Jordan Glatt, Phanindra V. Wunnava
iBusiness (IB) , 2018, DOI: 10.4236/ib.2018.102004
Abstract: The scarring effect is defined as an increase in the probability of future unemployment spells and the reduction of subsequent wages as the result of joblessness early in one’s working years. Many youths get into a rut at the beginning of their professional careers when they become unemployed, hindering future individual prospects and producing negative consequences for the economy as a whole. Because there is considerable evidence in the United States that early job displacement is followed by a higher risk of subsequent unemployment and lower trajectory for future earnings after re-entry, it is crucial to gain a better understanding of the economic factors that influence the youth unemployment rate in order to reduce the consequences on youths’ future outlooks [22]. This study not only demonstrates that the scarring effect is real but also allows for policy recommendations to be obtained from this analysis.
Call for Biohistory Guidelines
Jordan Paradise
PLOS Medicine , 2005, DOI: 10.1371/journal.pmed.0020192
Targeting estrogen to kill ER-positive and ER-negative breast cancer
VC Jordan
Breast Cancer Research , 2005, DOI: 10.1186/bcr1053
Infant feeding and analgesia in labour: the evidence is accumulating
Sue Jordan
International Breastfeeding Journal , 2006, DOI: 10.1186/1746-4358-1-25
Abstract: Torvaldsen and colleagues have published an interesting paper [1] on an extremely important topic: the impact of intrapartum analgesia on infant feeding. If intrapartum analgesics do interfere with breastfeeding, this might, arguably, be the adverse drug reaction with the greatest public health consequences. To explore this issue, Torvaldsen and colleagues revisited a 1997 cohort to examine the factors affecting duration of breastfeeding up to 24 weeks. These authors are among the first to employ a Cox proportional hazards regression model in this field. This illuminating analysis suggests that both intrapartum pethidine and epidurals can increase the likelihood of breastfeeding cessation: 210/292 (72%) women who had no pharmacological analgesia were breastfeeding at 24 weeks compared to 139/261 (53%) who received pethidine and 206/396 (52%) who received epidurals containing bupivacaine and fentanyl (hazard ratios [HR]: 1.95, 95% CI [confidence interval]: 1.45, 2.63 and 2.07, 95% CI: 1.57, 2.72).Women feed their babies infant formula for a variety of reasons: physical limitations; medical advice; psychosocial factors; cultural norms and expectations. Recently, the possibility that infant feeding is also constrained by pharmacological influences has attracted the attention of researchers. Several studies, including this [1], have suggested that 'failure to breastfeed' is linked to administration of intrapartum analgesics.When deciding whether to accept, administer or advocate intrapartum analgesia, women, their clinicians, and those who compose clinical guidelines, need to consider whether 'failure to breastfeed' is a foreseeable and preventable adverse effect of opioids or epidurals. Is the association between analgesia and feeding infant formula strong enough to meet the criteria for an adverse drug reaction?If failure to breastfeed is considered an appreciably harmful or unpleasant reaction, related to the use of intrapartum analgesics, and administration predicts
Os experimentos prismáticos de Goethe
Jordan, Fred;
Estudos Avan?ados , 1993, DOI: 10.1590/S0103-40141993000300007
Abstract: the essay intends to stimulate the carrying out of prismatic experiments with very simple resources and, therewith, ease the access to goethe's fundamental color studies, the "farbenlehre". the included folder contains photographs of a complementary prismatic process produced by neutral bright-dark model-images. it also contains photographs of prismatic images produced by colored model-images.
The Challenges of Librarianship in the Expanding Library Service Worldwide
Jay Jordan
Liber Quarterly : The Journal of European Research Libraries , 2003,
Abstract: Good evening! It is an honor for me to participate in the LIBER conference. LIBER is a very important organization, and OCLC PICA was pleased to become one of the first patron sponsors of LIBER in 2002. We are very interested in strengthening the relationship between our two organizations. OCLC PICA participants are also members of LIBER. Some of you may know that OCLC PICA has paid subscriptions to LIBER for 18 libraries in Eastern Europe since 2000. We are doing so because we want to help these libraries participate in the European library community. This evening I will discuss the challenges of expanding library service worldwide. This is a topic at OCLC that we are very familiar with, because OCLC is a global library cooperative, helping libraries serve people by providing economical access to knowledge through innovation and collaboration. The cooperative is a truly international community. There are some 34,500 libraries in the U.S. that are participating in the OCLC cooperative. There are now approximately 8,000 libraries in 85 countries outside the U.S. that are participating. There are about 3,000 libraries, primarily institutions of higher education, participating in OCLC in Asia Pacific. There are approximately 800 participating institutions in Canada. There are approximately 678 participating institutions in Latin America and the Caribbean. In Europe, the Middle East and Africa, there are approximately 4,100 institutions participating in OCLC. Our cooperative is global indeed. We will be working the coming year to increase not only the numbers on the map, but also the level of participation by libraries and other cultural heritage organizations in our programs and services. What are some the challenges that librarianship faces?
Book Review: Practical Open Source Software for Libraries
Mark Jordan
Partnership : the Canadian Journal of Library and Information Practice and Research , 2012,
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