ON THE INDEPENDENCE OF THE SAMPLE MEAN AND TRANSLATION-INVARIANT STATISTICS FOR MATRIX NORMAL DISTRIBUTIONS

We present an explicit characterization of the joint dependency structure of an n×p matrix normal random matrix such that the p-dimensional sample mean vector is independent of all translation invariant statistics.     

Optimal Times to Contact Sample Households

Finding a suitable respondent at home is an essential and expensivecomponent of a household survey. This article reports on theresults of a study of the probabilities of finding someone aged14 or older at home and discusses the application of such datato survey design and budgeting.     

An evaluation of the tandem configuration automated guided vehicle system

The performance of a tandem automated guided vehicle (AGV) system is compared with that of conventional AGV track systems. In the tandem system the track is divided into non-overlapping, single-vehicle closed loops. Using simulation it is shown that, because of trips requiring delivery across loops, the tandem system has a higher expected travel time per load and thus a greater average time in system. When the loads are delivered within the original loop only, the tandem system has a lower average time in system than in conventional systems, although the difference is modest. Track layout appears to influence the average time in system much more than docs the dispatching rule invoked. The success of the tandem system is highly dependent on approximately even AGV utilization, which may be difficult to obtain in practice.     

The relation between early abuse and adult sexuality

One thousand and thirty‐two (566 non‐Asian; 466 Asian) undergraduates were assessed in a confidential laboratory setting regarding levels of physical abuse, emotional abuse, sexual abuse, neglect, and a wide range of sexuality variables. The purpose was to examine relationships between specific forms of early abuse and later adult sexuality, and to assess potential gender and ethnic differences in these associations. Independent of other forms of abuse, sexual abuse in females was significantly positively related to sexual drive and experience, range of sexual fantasies, liberal sexual attitudes, frequency of intercourse and masturbation, and likelihood of engaging in unrestricted sexual behaviors and fantasies, and was negatively related to virginity status. Among males, emotional abuse was significantly associated with poor body image and sexual dissatisfaction, independent of the other forms of abuse. There were no significant differences in associations between early abuse and sexuality between persons of Southeast Asian and European ancestry.     

Job queues, discrimination, and affirmative action

If employers have different Becker-type discrimination coefficients for different demographic groups, then the implementation of affirmative action may have a differential impact on those groups. We estimate two vector autoregressive models of the U.S. economy, including the unemployment rates of four demographic groups. We find that a job queue existed before the implementation of affirmative action and that affirmative action changed the ordering of the job queue in manner that had a negative impact on nonwhite males. We find evidence that affirmative action may have increased the unemployment rate of nonwhite males by increasing their duration of unemployment.     

Television Coverage of State Government

An empirical analysis of 3,334 state and local television newsstories in 10 cities clarifies the reluctance of commercialtelevision newscasters to cover state government. Contrary towhat many television news directors assert, television's minimalattention to state government cannot be attributed to an allegednegative relationship between state government and newscastratings. Rather, it appears to stem from the high cost of obtainingfilmed coverage of state government in a timely fashion.     

ABORTION AND CRIME: UNWANTED CHILDREN AND OUT-OF-WEDLOCK BIRTHS

Legalizing abortion can either increase or decrease investments in children's human capital. This article finds that abortion increases the number of out-of-wedlock births. Using data that more directly links the criminal with age when the crime was committed, not age when arrested, and fixing the assumption in previous research that no abortions took place prior to the Roe v. Wade decision in the 45 states affected by that decision, we find consistent significant evidence that legalizing abortions increased murders by over 7%. Linear estimates indicate that legalization increased total annual victimization costs by at least $3.2 billion. ( JEL K42, K14, J24)     

HISTORICAL AND CURRENT FACTORS DISCRIMINATING SEXUALLY FUNCTIONAL FROM SEXUALLY DYSFUNCTIONAL MARRIED COUPLES*

Clinical literature has noted numerous past and current psychosocial factors characteristicof sexually dysfunctional individuals. However, there is almost no empirical documentation of factorsdiscriminating sexually functional from dysfunctional couples. The present study compared the responses of 94 clinical couples accepted for sex therapy with 110 nonclinical couples, selected from the same community. The couples were in their mid-30s, married an average of 12 years, middle income, rather well educated, and over 75% had at least one child. Individuals completed a 517-question Personal History Questionnaire (PHQ), and sex and marital defensiveness scales. The PHQ wasclinically and empirically developed, resulting in 54 internally consistent scales. Major analyses tested the discriminating power of past and current PHQ scales. The best discriminators were sexual functioning scales, historical and affective scales for women, and current and fantasy scales for men. Several surprising results appeared, including the importance of first coitus and the lack of importance of marital satisfaction, communication and sexual history scales. Four conclusionswere discussed relevant to the separation of sex and relationship satisfaction, the separation of sexualfunctioning and sexual satisfaction, and the differential impact of sexual problems on men and women.