Despite the theoretical importance of intragenerational mobility and its connection to intergenerational mobility, no study since the 1970s has documented trends in intragenerational occupational ...mobility. The present article fills this intellectual gap by presenting evidence of an increasing trend in intragenerational mobility in the United States from 1969 to 2011. We decompose the trend using a nested occupational classification scheme that distinguishes between disaggregated micro-classes and progressively more aggregated meso-classes, macro-classes, and manual and nonmanual sectors. Log-linear analysis reveals that mobility increased across the occupational structure at nearly all levels of aggregation, especially after the early 1990s. Controlling for structural changes in occupational distributions modifies, but does not substantially alter, these findings. Trends are qualitatively similar for men and women. We connect increasing mobility to other macro-economic trends dating back to the 1970s, including changing labor force composition, technologies, employment relations, and industrial structures. We reassert the sociological significance of intragenerational mobility and discuss how increasing variability in occupational transitions within careers may counteract or mask trends in intergenerational mobility, across occupations and across more broadly construed social classes.
Using data from three British birth cohort studies, we examine patterns of social mobility over three generations of family members. For both men and women, absolute mobility rates (i.e., total, ...upward, downward, and outflow mobility rates) in the partial parents-children mobility tables vary substantially by grandparents' social class. In terms of relative mobility patterns, we find a statistically significant association between grandparents' and grandchildren's class positions, after parents' social class is taken into account. The net grandparents-grandchildren association can be summarized by a single uniform association parameter. Net of parents' social class, the odds of grandchildren entering the professional-managerial class rather than the unskilled manual class are at least two and half times better if the grandparents were themselves in professional-managerial rather than unskilled manual-class positions. This grandparents effect in social mobility persists even when parents' education, income, and wealth are taken into account.
The study of human mobility is crucial due to its impact on several aspects of our society, such as disease spreading, urban planning, well-being, pollution, and more. The proliferation of digital ...mobility data, such as phone records, GPS traces, and social media posts, combined with the predictive power of artificial intelligence, triggered the application of deep learning to human mobility. Existing surveys focus on single tasks, data sources, mechanistic or traditional machine learning approaches, while a comprehensive description of deep learning solutions is missing. This survey provides a taxonomy of mobility tasks, a discussion on the challenges related to each task and how deep learning may overcome the limitations of traditional models, a description of the most relevant solutions to the mobility tasks described above, and the relevant challenges for the future. Our survey is a guide to the leading deep learning solutions to next-location prediction, crowd flow prediction, trajectory generation, and flow generation. At the same time, it helps deep learning scientists and practitioners understand the fundamental concepts and the open challenges of the study of human mobility.
International scientific mobility and research careers are two concepts that are intimately related. Yet, it has been very difficult for scholarship to pinpoint exactly how international mobility ...impacts on research careers. This paper contributes to this question by investigating links between international mobility, research career stage progression and job changes. It does so using a large-scale survey (MORE) which targets researchers based in European universities. The results establish that the profile of international mobility varies by academic research career stage. They also show that for researchers in the established mid-career phase who are working internationally, there are career advancement benefits associated with return mobility to their home country. However, these benefits may reduce if the timing of return is too delayed. The paper concludes by discussing the implications of these results for researcher mobility policy in the context of the European Higher Education Area and the European Research Area.
Discussions of high-skilled mobility typically evoke migration patterns from poorer to wealthier countries, which ignore movements to and between developing countries. This paper presents, for the ...first time, a global overview of human capital mobility through bilateral migration stocks by gender and education in 1990 and 2000, and calculation of nuanced brain drain indicators. Building on newly collated data, we use a novel estimation procedure based on a pseudo-gravity model. We identify key determinants of international migration, which we subsequently use to impute missing data. Non-OECD destinations account for one-third of skilled-migration, while OECD destinations are declining in relative importance.
'Multigenerational mobility' refers to the associations in socio-economic status across three or more generations. This article begins by summarising the long-standing but recently growing empirical ...literature on multigenerational mobility. It then discusses multiple theoretical interpretations of the empirical patterns, including the one recently proposed in Gregory Clark's book The Son Also Rises.
Labor mobility is the flexibility of workers to walk away from an industry in response to better opportunities. I develop a model in which labor flows make bad times worse for shareholders who are ...left with capital that is less productive. The model shows that firms face greater operating leverage by providing flexibility to mobile workers. I construct an empirical measure of labor mobility consistent with the model and document an economically significant cross-sectional relation between mobility, operating leverage, and stock returns. I find that firms in mobile industries earn returns over 5% higher than those in less mobile industries.
The isomeric heterogeneity of glycans poses a great challenge for their analysis. While combining ion mobility spectrometry (IMS) with tandem mass spectrometry is a powerful means for identifying and ...characterizing glycans, it has difficulty distinguishing the subtlest differences between isomers. Cryogenic infrared spectroscopy provides an additional dimension for glycan identification that is extremely sensitive to their structure. Our approach to glycan analysis combines ultrahigh-resolution IMS-IMS using structures for lossless ion manipulation (SLIM) with cryogenic infrared spectroscopy. We present here the design of a SLIM board containing a series of on-board traps in which we perform collision-induced dissociation (CID) at pressures in the millibar range. We characterize the on-board CID process by comparing the fragments generated from a pentapeptide to those obtained on a commercial tandem mass spectrometer. We then apply our new technique to study the mobility and vibrational spectra of CID fragments from two human milk oligosaccharides. Comparison of both the fragment drift times and IR spectra with those of suitable reference compounds allows us to identify their specific isomeric form, including the anomericity of the glycosidic linkage, demonstrating the power of this tool for glycan analysis.
We use new estimators of directional rank mobility developed by Bhattacharya and Mazumder (2011) to compare rates of upward and downward intergenerational mobility across three countries: Canada, ...Sweden and the United States. These measures overcome some of the limitations of traditional measures of intergenerational mobility such as the intergenerational elasticity, which are not well suited for analyzing directional movements or for examining differences in mobility across the income distribution. Data for each country include highly comparable, administrative data sources containing sufficiently long time spans of earnings. Our most basic measures of directional mobility, which simply compare whether sons moved up or down in the earnings distribution relative to their fathers, do not differ much across the countries. However, we do find that there are clear differences in the extent of the movement. We find larger cross-country differences in downward mobility from the top of the distribution than upward mobility from the bottom. Canada has the most downward mobility while the U.S. has the least, with Sweden in the middle. We find some differences in upward mobility but these are somewhat smaller in magnitude. An important caveat is that our analysis may be sensitive to the concept of income we use and broader measures such as family income could lead to different conclusions. Also, small differences in rank mobility translate into rather large differences in absolute mobility measured in dollars, due to large differences in income inequality across countries.
•We compare intergenerational mobility across Canada, Sweden and the United States.•Canada has the most downward mobility and the United States has the least.•We find only small cross-country differences in upward rank mobility.•We find rather large cross-country differences in absolute mobility.
Here we examine the relationship among resolving power (R p), resolution (R pp), and collision cross section (CCS) for compounds analyzed in previous ion mobility (IM) experiments representing a wide ...variety of instrument platforms and IM techniques. Our previous work indicated these three variables effectively describe and predict separation efficiency for drift tube ion mobility spectrometry experiments. In this work, we seek to determine if our previous findings are a general reflection of IM behavior that can be applied to various instrument platforms and mobility techniques. Results suggest IM distributions are well characterized by a Gaussian model and separation efficiency can be predicted on the basis of the empirical difference in the gas-phase CCS and a CCS-based resolving power definition (CCS/ΔCCS). Notably traveling wave (TWIMS) was found to operate at resolutions substantially higher than a single-peak resolving power suggested. When a CCS-based R p definition was utilized, TWIMS was found to operate at a resolving power between 40 and 50, confirming the previous observations by Giles and co-workers. After the separation axis (and corresponding resolving power) is converted to cross section space, it is possible to effectively predict separation behavior for all mobility techniques evaluated (i.e., uniform field, trapped ion mobility, traveling wave, cyclic, and overtone instruments) using the equations described in this work. Finally, we are able to establish for the first time that the current state-of-the-art ion mobility separations benchmark at a CCS-based resolving power of >300 that is sufficient to differentiate analyte ions with CCS differences as small as 0.5%.
PDF
