RCBDs with a control

The randomized complete block designs, RCBDs, are among the most popular of block designs for comparing a set of experimental treatments. The question of this design's effectiveness when one of the treatments is a control is examined here. Optimality ranges are established for the RBCD in terms of the strength of interest in control comparisons. It is found that if the control treatment is of secondary interest, the RCBD, when not best, is typically near best. This is not so when comparisons with the control are of greater interest than those among the other treatments.     

Explaining Family Change and Variation: Challenges for Family Demographers

Twenty years ago, the National Institute of Child Health and Human Development (NICHD) issued a request for proposals that resulted in the National Survey of Families and Households (NSFH), a unique survey valuable to a wide range of family scholars. This paper describes the efforts of an interdisciplinary group of family demographers to build on the progress enabled by the NSFH and many other theoretical and methodological innovations. Our work, also supported by NICHD, will develop plans for research and data collection to address the central question of what causes family change and variation. We outline the group's initial assessments of orienting frameworks, key aspects of family life to study, and theoretical and methodological challenges for research on family change. Finally, we invite family scholars to follow our progress and to help develop this shared public good.     

E-optimal design in irregular BIBD settings

When the necessary conditions for a BIBD are satisfied, but no BIBD exists, there is no simple answer for the optimal design problem. This paper identifies the E-optimal information matrices for any such irregular BIBD setting when the number of treatments is no larger than 100. A- and D-optimal designs are typically not E-optimal. An E-optimal design for 15 treatments in 21 blocks of size 5 is found.     

Use and Usability of Assisted Living Facilities for the Elderly: An Observation Study in Gothenburg Sweden

To meet the demographic development, measures were initiated by the Swedish government entailing changed conditions for municipal eldercare, such as assisted living. Participant observation is used to study the daily use of common spaces in 14 assisted living units in Gothenburg. The results show examples where the current use diverges from the intended use and suggest diverging objectives and conflicts of use. The observations indicate that the degree of usability is determined by the physical environment itself in some cases, by the users and by changes in use in other cases, and by a combination of both in some cases.     

Factors That Influence Willingness to Help the Homeless

Homelessness is an ongoing challenge for many families and individuals. Many struggle to meet their basic needs for food, clothing and shelter. Unfortunately, we know very little about the people who directly help homeless people meet these needs. The present study examines the relationships between empathy, religion, household income, political orientation, gender, race, and people's expressed willingness to assist the homeless. Results demonstrate a strong and consistent link between empathy and willingness to help. Moderately consistent associations are found for religion and race. Limitations, suggestions for further research, and for practical application are discussed.