The Horseshoe Estimator: Posterior Concentration around Nearly Black Vectors

We consider the horseshoe estimator due to Carvalho, Polson and Scott (2010) for the multivariate normal mean model in the situation that the mean vector is sparse in the nearly black sense. We assume the frequentist framework where the data is generated according to a fixed mean vector. We show that if the number of nonzero parameters of the mean vector is known, the horseshoe estimator attains the minimax $\ell_2$ risk, possibly up to a multiplicative constant. We provide conditions under which the horseshoe estimator combined with an empirical Bayes estimate of the number of nonzero means still yields the minimax risk. We furthermore prove an upper bound on the rate of contraction of the posterior distribution around the horseshoe estimator, and a lower bound on the posterior variance. These bounds indicate that the posterior distribution of the horseshoe prior may be more informative than that of other one-component priors, including the Lasso.Comment: This version differs from the final published version in pagination and typographical detail; Available at http://projecteuclid.org/euclid.ejs/141813426

Changes in contact and support within intergenerational relationships in the Netherlands: A cohort and time-sequential perspective

This study investigates whether the frequency of contact and support exchanged in relationships between parents and adult children declines over successive cohorts and over individual time in the Netherlands. Respondents included a birth cohort from 1928 to 1937 with data collected in 1992 (N=941) and in 2002 (N=574) and a birth cohort from 1938 to 1947 with data collected in 2002 (N=884). We assessed cohort and time-sequential changes. Parents of the later cohort had more contact and support exchanges with their children than the earlier cohort, revealing that families have not declined in importance. Furthermore, longitudinally, contact and supportive exchanges with adult children 1

Organizational rules and cognitive uncertainty among public professionals: a daily diary study

Although public management and human resource management research has extensively investigated the motivational effects of organizational rules, the original utility of organizational rules—uncertainty reduction—has remained overlooked. This study takes a cognitive perspective by examining how organizational rules relate to uncertainty experiences of public professionals. In this study, we provide a dynamic perspective on the relationship between organizational rules and uncertainty through a 2-week daily online diary study among 65 public professionals in the Netherlands. The results indicate that the amount and consistency of rules are related to professionals’ daily uncertainty experiences. Moreover, within-person experiences of rules and uncertainty are highly variable over time. We argue that a cognitive perspective of uncertainty reduction can broaden our understanding of the consequences of organizational rules in managing people, and that the dynamic nature of organizational rule experiences cannot be a mere footnote in future public administration and human resource management research.Public Health and primary carePrevention, Population and Disease management (PrePoD

Who is in the stepfamily? Change in stepparents’ family boundaries between 1992-2009

Guided by trends of increased prevalence and social acceptance of stepfamilies, the authors argue that stepparents are more likely to include stepchildren in their personal network in recent times. Data are from observations by 2 studies: (a) the Living Arrangements and Social Networks of Older Adults Study and (b) the Longitudinal Aging Study Amsterdam in 1992-2009 of 247 Dutch stepparents age 54-91 years. The results revealed that in 1992, 63% of the stepparents had stepchildren in their personal network, and this percentage increased to 85% in 2009. The network membership of stepchildren was less likely for stepparents from living-apart-together partnerships. Stepmothers less often included stepchildren in their personal network than stepfathers. Both effects may be understood in terms of family commitment. Stepfamily boundaries have become more permeable over time, suggesting that there is an increased potential for support exchange and caregiving within stepfamilies

(F)actsheet: leiderschap en onzekerheid

The politics and administration of institutional chang

(F)actsheet: innovatievermogen in de Wmo-wijkteams

The politics and administration of institutional chang

Leren van de crisis: adaptief bestuur geeft sociaal domein meer ruimte

The politics and administration of institutional chang

(F)actsheet: Regels in de JMO-teams

The politics and administration of institutional chang