Method of Digraphs for Multi-dimensional Screening

Kokovin Sergey G.; Nahata B.

doi:10.1007/s10479-016-2320-3

Publications

Article

Method of Digraphs for Multi-dimensional Screening

Annals of Operations Research. 2017. Vol. 253. No. 1. P. 431-451.

Kokovin S. G., Nahata B.

We study a general model of multi-dimensional screening for discrete types of consumers without the single-crossing condition or any other essential restrictions. Such generality motivates us to introduce graph theory into optimization by treating each combination of active constraints as a digraph. Our relaxation of the constraints (a slackness parameter) excludes bunching and cycles among the constraints. Then, the only possible solution structures arerivers, which are acyclic rooted digraphs, and the Lagrange multipliers can be used to characterize the solutions. Relying on these propositions, we propose and justify an optimization algorithm. In the experiments, its branch-and-bound version with a good starting plan shows fewer iterations than a complete search among all rivers.

Priority areas: economics

Language: English

DOI

Keywords: screening

Publication based on the results of: Теория несовершенных рынков, городская и региональная экономика, международная и межрегиональная торговля(2017)

Cкрининги I этапа диспансеризации: систематический обзор долгосрочной эффективности

Реброва О. Ю., Федяева В. К., Омельяновский В. В. и др. Профилактическая медицина. 2017. Т. 20. № 3. С. 55-59.

Objective — to make a systematic search and an analysis of evidence for the long-term population-based efficiency of screenings and other measures implemented in the framework of Stage 1 screening during periodical health check in the Russian Federation according to the Order №36ан dated 2015. Material and methods. A systematic search was carried out independently by two authors in four databases: Scientific Electronic Library, Cochrane Library, Medline/PubMed, and USPSTF. Systematic reviews are an investigated publications type. The criteria for the efficacy of screening were overall and specific mortality and disability. The methodological quality of systematic reviews was assessed by two authors by the procedure using the international AMSTAR questionnaire. Results. Only a fecal occult blood test and abdominal aorta ultrasonography have a scientific justification as screening methods in certain age and gender populations by the criterion for reducing the specific mortality, while the methodological quality of systematic reviews is high and medium/high. The efficiency of mammography in women has not been proven in high methodological quality studies.

Added: Sep 7, 2017

Fraternities and Labor-market Outcomes

Popov S. V., Bernhardt D. American Economic Journal: Microeconomics. 2012. Vol. 4. No. 1. P. 116-141.

We model how student choices to rush a fraternity, and fraternity admission choices, interact with signals firms receive about student productivities to determine labormarket outcomes. The fraternity and students value wages and fraternity socializing values. We provide sufficient conditions under which, in equilibrium, most members have intermediate abilities: weak students apply, but are rejected unless they have high socializing values, while most able students do not apply to avoid taint from association with weaker members. We show this equilibrium reconciles the ability distribution of fraternity members at the University of Illinois, and estimate the fraternity’s welfare impact on different students.

Added: Aug 31, 2012

The Russian version of the Oxford Cognitive Screen: Validation study on stroke survivors

Shendyapina M., Kuzmina E., Kazymaev S. et al. Neuropsychology. 2019. Vol. 33(1). P. 77-92.

Abstract

OBJECTIVE:

The Oxford Cognitive Screen (OCS) is a screening tool for the assessment of poststroke deficits in attention, memory, praxis, language, and number processing. The goal of the present study was to develop a Russian version of the OCS (Rus-OCS) via translation of the original battery, its cultural and linguistic adaptations, and reporting preliminary findings on its psychometric properties.

METHOD:

All parts of OCS were translated by native Russian-speaking neuropsychologists. Russian-speaking stroke patients (N = 205) were assessed with the Rus-OCS. Their performance was compared with performance of 60 healthy Russian-speaking adults aged between the ages of 18 and 91 years. The performance of 15 stroke patients and 42 healthy adults were assessed with a parallel version within 7 days of first testing. Convergent validity of the Rus-OCS was established via correlations with comparable tasks. Performance of three stroke groups with different lesion lateralization (right, left, and bilateral) was compared on language and visual attention subtasks. Preliminary normative data based on 5th to 95th percentile were also reported.

RESULTS:

Measures of internal consistency and test-retest reliability ranged from acceptable to very good and estimates of convergent validity ranged from moderate to high. Sensitivity and specificity was found to range from .56 to 1 and from .73 to 1, respectively. Significant differences in performance between stroke and healthy groups on all subtasks confirmed the discriminative power of the Rus-OCS was good.

CONCLUSIONS:

Rus-OCS is a promising cognitive screening instrument for Russian-speaking patients. However, further validation is needed. Constraints of socioeconomic differences between Russian speakers in the wider population should be considered. (PsycINFO Database Record (c) 2018 APA, all rights reserved).

Added: Nov 1, 2018

Экономика и управление: проблемы и перспективы развития. Сборник научных статей по итогам международной научно-практической конференции г.Волгоград 15-16 ноября 2010 г.

Ч. 1. Волгоград: Волгоградское научное издательство, 2010.

Added: Jan 18, 2013

Экономическая активность населения России в 1990-е гг.

Гимпельсон В. Е. Проблемы рынка труда. WP3. Высшая школа экономики, 2002. № 01.

Added: Mar 26, 2013

Обновляемый образовательный ресурс "Экономическая школа НИУ ВШЭ"

2012.

Added: Feb 22, 2013

На океанских волнах. Россия в мировом кризисе

Уринсон Я. М. Вестник Европы. 2014. № 38-39.

Added: Feb 5, 2018

Применение различных вариантов правила передачи голосов

Карпов А. В., Вольский В. И. Полития: Анализ. Хроника. Прогноз. 2011. № 2. С. 162-174.

Added: Jun 24, 2011

Влияние выбора целей и инструментов политики денежных властей на уязвимость экономик

Трунин П. В., Дробышевский С. М., Евдокимова Т. В. М.: Издательский дом «Дело» РАНХиГС, 2012.

Added: Mar 26, 2013

Институт минимальной заработной платы в странах ОЭСР

Вишневская Н. Т. Проблемы рынка труда. WP3. Высшая школа экономики, 2005. № 03.

The paper examines the institute of minimum wage in developed and transition economies and in a number of the developing countries. First of all the institutional mechanism of minimum wage fixing is considered. One of the sections explores the dynamics of absolute and relative levels of minimum wage. The special attention is paid to the impact of the institute of minimum wage on the labour market. The author considers the mechanism of transmission of the minimum wage increases on the employment and unemployment dynamics. The paper also contains the result of the empirical research. The experience of many countries witnesses that large increases in minimum wage levels lead to the stagnation of the employ-ment, especially of the disadvantaged groups. The negative effect is larger for the companies with higher share of labour costs and more active use of unqualified labour, that is small businesses and agricultural enterprises. One of the main conclusions is that the minimum wage is not an effective tool of the poverty reduction as the majority of the recipients live in households of average and upper average income.

Added: Oct 13, 2012

Численность и состав российской бюрократии: между советской номенклатурой и госслужбой гражданского общества

Гимпельсон В. Е. Проблемы рынка труда. WP3. Высшая школа экономики, 2002. № 05.

Added: Mar 26, 2013

Правовые институты в России 2000-2007 годах: взгляд со стороны бизнеса

Яковлев А. А. Общественные науки и современность. 2008. № 4. С. 21-37.

Added: Sep 22, 2012