Влияние статуса инвалидности на предложение труда в России
Randomized controlled trials (RCTs) are considered gold standard in generating judicious evidence to support treatment decisions. Ideal-typical trials are called explanatory trials to distinguish it from trials completed under real-world conditions. The four most prevalent types of bias (selection-, performance-, attrition-, and detection-bias) can be avoided and internal validity of a study can be increased if all requested quality criteria will be met. The external validity can be neither investigated not can it be confirmed by randomized trials. But the confirmation of external validity is as important as the confirmation of internal validity because knowledge that has been generated in RCTs will be valuable only if it can be successfully applied to patients under real-world conditions. For confirmation of external validity the mentioned four types of bias have to be avoided. In addition, it has to be confirmed that the individuals from whom the evidence was derived are comparable to the individuals to whom the evidence should be applied. Violation of this simple appearing requirement is called 'sampling bias'. A two-step procedure seems to be useful to confirm internal as well as external evidence. As first step the efficacy of a therapeutic principle may be confirmed under ideal study conditions by using an explanatory trial without demanding the confirmation of external validity. In a second step the benefit for the investigated group of patients is examined under real-world conditions (pragmatic trial). The design and established methods for evaluation of these studies are discussed. The two-step approach offers three advantages: it reduces the risk to over-interpret the results of RCTs as explanatory trials can only demonstrate efficacy under ideal conditions. The benefit which is requested by our authorities can be demonstrated only by pragmatic trials which consider the external validity. Progress may possibly achieved only if controlled pragmatic trials will be used which can compare the influence of the intended (specific treatment effect) intervention with not-intended (confounder) interventions. Examples for these methods are the propensity score matching or structural equation models.
The article presents the experience of constructing of the social problems by students and teacher within the sociological course. Last years the course “Sociology of Social Problems” includes optional actionist part with a claims-making concerning some situations. The article describes actions made by the participants of the course with the aim to include in the city agenda such problems as the destroying of one of the famous historical buildings in Kazan (Karl Fuchs House), the inaccessibility of urban space for disabled people and the imposing of the music and ads on the pedestrians. The influence of such constructionist projects and their alleged significance for the students are discussed. In conclusion some questions concerning the transition from traditional teaching of sociology towards the teaching connected with the sociological intervention are formulated.
Postdoctoral programmes have recently become an important step leading from doctoral education to permanent academic careers in the social sciences. This paper investigates the effects of a large and structured postdoctoral programme in the social sciences on a number of academic and non-academic outcomes of fellows. Propensity score matching is employed to match fellows with applicants with similar characteristics who did not receive the fellowship; then the outcomes in the treatment and control groups are compared. The programme has a statistically significant positive effect on the general life satisfaction of former fellows and their publication activity. It is argued that an active and collegial research environment, with training in academic skills during postdoctoral employment, may improve the academic outcomes of postdoctoral fellows.
This paper explores the relationship between the characteristics of a street protest and its effectiveness. We propose a new approach to solving the problem through the use of a combination of several statistical techniques: the logistic regression models with mixed effects from the Frequentist approach, the hierarchical modeling from the Bayesian approach, the propensity score matching from the Quasiexperimental approach
This paper is the first to analyze the costs of job loss in Russia, using unique new data from the Russian Longitudinal Monitoring Survey over the years 2003–2008, including a special supplement on displacement that was initiated by us. We employ fixed effects regression models and propensity score matching techniques in order to establish the causal effect of displacement for displaced individuals. The paper is innovative insofar as we investigate fringe and in-kind benefits and the propensity to have an informal employment relationship as well as a permanent contract as relevant labor market outcomes upon displacement. We also analyze monthly earnings, hourly wages, employment and hours worked, which are traditionally investigated in the literature. Compared to the control group of non-displaced workers (i.e. stayers and quitters), displaced individuals face a significant income loss following displacement, which is mainly due to the reduction in employment and hours worked. This effect is robust to the definition of displacement. The losses seem to be more pronounced and are especially large for older workers with labor market experience and human capital acquired in Soviet times and for workers with primary and secondary education. Workers displaced from state firms experience particularly large relative losses in the short run, while such losses for workers laid off from private firms are more persistent. Turning to the additional non-conventional labor market outcomes, there is a loss in terms of the number of fringe and in-kind benefits for reemployed individuals but not in terms of their value. There is also some evidence of an increased probability of working in informal jobs if displaced. These results point towards the importance of both firm-specific human capital and of obsolete skills obtained under the centrally planned economy as well as to a wider occurrence of job insecurity among displaced workers.
We consider certain spaces of functions on the circle, which naturally appear in harmonic analysis, and superposition operators on these spaces. We study the following question: which functions have the property that each their superposition with a homeomorphism of the circle belongs to a given space? We also study the multidimensional case.
We consider the spaces of functions on the m-dimensional torus, whose Fourier transform is p -summable. We obtain estimates for the norms of the exponential functions deformed by a C1 -smooth phase. The results generalize to the multidimensional case the one-dimensional results obtained by the author earlier in “Quantitative estimates in the Beurling—Helson theorem”, Sbornik: Mathematics, 201:12 (2010), 1811 – 1836.
We consider the spaces of function on the circle whose Fourier transform is p-summable. We obtain estimates for the norms of exponential functions deformed by a C1 -smooth phase.