A Mathematical Approach to Categorization and Labeling of Qualitative Data: the Latent Categorization Method

As text databases increasingly become available to researchers, the limits to human cognition are rapidly reached. Focusing on examining objective realities, this paper introduces the latent categorization method, a novel new research method for analysis of large and midsize data sets. This method clusters text artifacts and extracts the words that were most important in creating the clusters. Further, it demonstrates a set of techniques for extracting knowledge from a representative data set involving 6135 abstracts from a variety of business‐related journals .     

Hutterite fecundability by age and parity: Strategies for frailty modeling of event histories

Effective fecundability declines with age and parity. Furthermore, women differ in their effective fecundability: some women have persistently low or high monthly chances of live-birth conception. Estimates are presented concerning the magnitude of these effects in a natural-fertility population: 406 Hutterite women in North America who had 3,206 births, largely in the 1940s and 1950s. The estimates are based on models that incorporate the effects of persistent heterogeneity and that use the full information provided by multiple-spell duration data. In addition, hazards rather than probabilities are modeled, piecewise linear hazard functions are used, and age and parity effects are decomposed systematically. These methods permit the development of more elaborate models of changing fecundability and of heterogeneity in postpartum amenorrhea.     

Factors affecting adoption in China, 1950-87

Though adoption in China is known to have increased as more girls were abandoned and became available for adoption following the introduction of the country's one-child policy in the 1980s, little is known about Chinese adoption practices. This paper investigates the factors affecting adoption in China in the period 1950-87 using data from the National Two-Per-Thousand Sample Survey on Fertility and Contraception of 1988. The results show that the national adoption rate was 2.3 per cent. Childless women were more likely than women with children to adopt and did not show a sex preference. Women with children by birth used adoption to secure a child of the 'missing' sex. Women who had experienced the death of a child were more likely to adopt than those who had not. Women with children may have used adoption as a strategy to circumvent the strict family planning policies.     

Structural unemployment. An analysis of recruitment and selection mechanisms based on panel data among Danish long-term unemployed

The perception of structural unemployment – summarised in the notion of 'Eurosclerosis'– became almost hegemonic during the 1990s. Policy makers all over Europe tried, by means of supply-side policies, to counteract the lack of incentives in the developed European welfare states, the lack of qualification on the post-industrial labour markets and the personal decay due to long-term unemployment. However, based on the critical case of Denmark, this article challenges the perception of structural unemployment and suggests an alternative business cycle/barrier perception. At the macro level it is difficult to explain the Danish decline in unemployment from 1994 to 2000 within the structure perception. The lack of explanatory power of the structure perception is further highlighted in micro-level analyses conducted on a panel study of long-term unemployed. Based on the unemployed's own assessments, we find no indications of supply-side problems. These results are supported by analyses of actual labour market integration of the long-term unemployed in the period between 1994 and 1999, which show that education level and previous unemployment had no noteworthy influence on labour market integration, whereas age had a decisive influence. These surprising results further undermine the perception of structural unemployment and the supply-side policies rooted in this 'mistaken' problem definition.     

Behavioral health service use and costs among children in foster care

This article compares behavioral health service use and cost for foster care versus nonfoster care children; children before, during, and after foster care placement; and successfully reunified versus nonsuccessfully reunified foster care children. Behavioral health service costs for children in foster care were higher than for children not in foster care. Children in foster care used more services during their foster care placement than before placement and after discharge. Nonsuccessfully reunified children received a significantly larger quantity of services than those successfully reunified.     

Maximum Likelihood Inference for Multivariate Frailty Models Using an Automated Monte Carlo EM Algorithm

We present a maximum likelihood estimation procedure for the multivariate frailty model. The estimation is based on a Monte Carlo EM algorithm. The expectation step is approximated by averaging over random samples drawn from the posterior distribution of the frailties using rejection sampling. The maximization step reduces to a standard partial likelihood maximization. We also propose a simple rule based on the relative change in the parameter estimates to decide on sample size in each iteration and a stopping time for the algorithm. An important new concept is acquiring absolute convergence of the algorithm through sample size determination and an efficient sampling technique. The method is illustrated using a rat carcinogenesis dataset and data on vase lifetimes of cut roses. The estimation results are compared with approximate inference based on penalized partial likelihood using these two examples. Unlike the penalized partial likelihood estimation, the proposed full maximum likelihood estimation method accounts for all the uncertainty while estimating standard errors for the parameters.     

Deservingness put into practice: Constructing the (un)deservingness of migrants in four European countries

The increased comparative research on perceptions of public welfare deservingness studies the extent to which different subgroups of citizens are deemed worthy or unworthy of receiving help from the welfare state. The concept of deservingness criteria plays a crucial role in this research, as it theorizes a universal heuristic that citizens apply to rank people in terms of their welfare deservingness. Due to the mainly quantitative nature of the research and despite the indisputable progress it has made, the subjective existence and actual application of these deservingness criteria remain a bit of a black box. What criteria of deservingness do citizens actually apply, and how do they apply them? This article opens the black box of welfare deservingness and sheds light on the nature and practice of deservingness criteria. Empirically, the paper explores how the deservingness of immigrants is discussed and established within 20 focus groups conducted in Slovenia, Denmark, UK, and Norway in 2016 with a total of 160 participants. All 20 focus groups discussed the welfare deservingness of immigrants based on similar vignette stimuli. Our analysis shows that (1) deservingness criteria are used both to construct images of target groups and as normative yardsticks; (2) deservingness criteria do not work independently of each other, but rather co-function in specific hybridized discourses; and (3) the moral logic of deservingness is supplemented by alternative moral logics, at least in the case of migrants.     

Promoting low-income preschoolers’ school readiness through a text messaging intervention

The aim of the study is to evaluate the effects of a language-rich math content text message intervention as a way to promote child literacy outcomes for children enrolled in 15 Head Start centers participating in Jumpstart. Two-hundred and fifty-eight families were randomly assigned to treatment (language-rich math text) or control (information about kindergarten enrollment) conditions. Families received text messages in English, Spanish, or written Chinese. Parents reported on children’s fall entry skills and family demography. Teachers reported on children’s interest in math and literacy. Children were directly assessed on literacy skills to determine if the language-rich math content increased literacy skills. Structural equation models reveal no main effects for the sample of 258, but subgroup analyses by language show intervention effectiveness. For families receiving text messages in English, effectiveness depended on children’s fall letter and shape knowledge for increasing phonological awareness (English). The intervention appears most effective for Spanish-speaking families by increasing children’s math and literacy interest, definitional vocabulary, and print knowledge. Limitations and finding implications are discussed.