A note on the minimum size of an orthogonal array

It is an elementary fact that the size of an orthogonal array of strength t on k factors must be a multiple of a certain number, say L_t, that depends on the orders of the factors. Thus L_t is a lower bound on the size of arrays of strength t on those factors, and is no larger than L_k, the size of the complete factorial design. We investigate the relationship between the numbers L_t, and two questions in particular: For what t is L_t < L_k? And when L_t = L_k, is the complete factorial design the only array of that size and strength t? Arrays are assumed to be mixed-level.

We refer to an array of size less than L_k as a proper fraction. Guided by our main result, we construct a variety of mixed-level proper fractions of strength k ? 1 that also satisfy a certain group-theoretic condition.     

Risk factors for preterm,low birthweight and small for gestational age births among Aboriginal women from remote communities in Northern Australia

Objective

To identify the risk factors for preterm birth, low birthweight and small for gestational age babies among remote-dwelling Aboriginal women.

Factors limiting SGM youths’ involvement in nonmetropolitan SGM community organizations

Sexual and gender minority (SGM) youths face risks due to growing up with stigmatized identities. SGM organizations minimize these risks by reducing isolation, promoting positive identity development, and providing access to supportive resources. However, nonmetropolitan SGM youths may have high risks with low access to SGM organizations. Little research has been conducted on nonmetropolitan SGM organizations. This study utilized in-depth interviews and open-ended survey items to explore the factors limiting SGM youths’ involvement in nonmetropolitan SGM organizations. Findings revealed three factors limiting involvement: accessibility, utility, and stigma. Implications for future research and practice with SGM youths are discussed.     

The practical utility of the Welch Emotional Connection Screen for rating parent–infant relational health

Emotional Connection (EC) measured by the Welch Emotional Connection Screen (WECS) was related to the Parent–Infant Interaction Rating System (PIIRS), a 5‐point adaptation of the rating system developed for the National Institute of Child Health and Human Development Study of Early Child Care and Youth Development (e.g., NICHD Early Child Care Research Network, 1999, Developmental Psychology, 35, 1399). Parent–infant dyads (n = 49 mothers; 43 fathers) were videotaped during face‐to‐face interaction at infant age 6 months; interactions were coded with both the WECS and PIIRS. At age 3, mothers completed the Child Behavior Checklist. WECS ratings of EC were associated with PIIRS rating items for both mother–infant and father–infant dyads. Mother–infant EC related positively to maternal sensitivity and positive regard for child, child positive mood and sustained attention, and dyadic mutuality, and negatively with maternal intrusiveness. Father–infant EC related positively to fathers' positive regard for child, child positive mood and sustained attention, and dyadic mutuality. Mother–infant EC predicted child behavior problems at age 3 better than mother–infant PIIRS ratings of dyadic mutuality. With fathers, neither EC nor dyadic mutuality ratings predicted mother‐reported child behavior problems. Findings highlight the practical utility of the WECS for identifying potentially at‐risk dyads and supporting early relational health.     

IDENTIFYING THE EFFECTS OF MONETARY POLICY SHOCKS ON EXCHANGE RATES USING HIGH FREQUENCY DATA

This paper proposes a new approach to identifying the effects of monetary policy shocks in an international vector autoregression. Using high‐frequency data on the prices of Fed Funds futures contracts, we measure the impact of the surprise component of the FOMC‐day Federal Reserve policy decision on financial variables, such as the exchange rate and the foreign interest rate. We show how this information can be used to achieve identification without having to make the usual strong assumption of a recursive ordering. (JEL: C32, E52, F30)     

Christianity and child sexual abuse — the survivors' voice leading to change

The Children Act 1989 states that due consideration should be given ‘to the child’s religious persuasion, racial origin and cultural and linguistic background'. Children who have been sexually abused and who grow up in families with strong Christian beliefs have additional concerns not readily identified by the child protection worker or therapist. Drawing upon 10 years' work experience, this paper aims to present the views and struggles of adult Christian women and men who have been sexually abused. Much of what is presented can be applied to other faith communities, since the difficulties lie sometimes with patriarchal communities, with male deities and with tenets of belief which can hinder the child from disclosing. Beliefs such as ‘Honour thy father and thy mother’, no sex before marriage and forgiveness of all had significant impact on survivors. Copyright © 2000 John Wiley & Sons, Ltd.