Teaching Personnel System Design: Manpower Utilization

This paper focuses upon how the resources and technology available to an organization can be organized and structured to accomplish program goals. A systems model is offered whereby emphasis upon self-control, communication, and feedback is applied to agency performance rather than effort. A growing use of different kinds of manpower and increasing specialization in social welfare agencies requires consideration of both the individual and the work environment. The way in which work is organized and structured may increasingly determine the kind and quality of services an agency provides to its clients.     

Serving the urban poor: a study of child welfare preventive services.

This summary, for journal publication, of a study whose full details are being published in book form, brings the welfare field up-to-date on what began as a precedent-setting agency. The Lower East Side Family Union, in New York City, has provided many years of service, and has justifiably drawn national attention from its inception, when prevention was more talked about than funded. The lessons to be drawn from its work and the example it has set grow more timely every year.     

The null distribution of the likelihood ratio test for a mixture of two normals after a restricted box-cox transformation

Maclean et al. (1976) applied a specific Box-Cox transformation to test for mixtures of distributions against a single distribution. Their null hypothesis is that a sample of n observations is from a normal distribution with unknown mean and variance after a restricted Box-Cox transformation. The alternative is that the sample is from a mixture of two normal distributions, each with unknown mean and unknown, but equal, variance after another restricted Box-Cox transformation. We developed a computer program that calculated the maximum likelihood estimates (MLEs) and likelihood ratio test (LRT) statistic for the above. Our algorithm for the calculation of the MLEs of the unknown parameters used multiple starting points to protect against convergence to a local rather than global maximum. We then simulated the distribution of the LRT for samples drawn from a normal distribution and five Box-Cox transformations of a normal distribution. The null distribution appeared to be the same for the Box-Cox transformations studied and appeared to be distributed as a chi-square random variable for samples of 25 or more. The degrees of freedom parameter appeared to be a monotonically decreasing function of the sample size. The null distribution of this LRT appeared to converge to a chi-square distribution with 2.5 degrees of freedom. We estimated the critical values for the 0.10, 0.05, and 0.01 levels of significance.     

Race/ethnic differences in respiratory problems among a nationally-representative cohort of young children in the United States

Using data from a nationally-representative cohort of young children in the United States, we ask the following: (1) Are there race/ethnic and birth weight differentials in the likelihood of developing respiratory problems by age three in a nationally representative birth cohort? (2) To what extent does birth weight, vis-á-vis other key sociodemographic risk factors, mediate race/ethnic differentials in reported respiratory problems? (3) Does the effect of birth weight on respiratory problems risk differ by race? We find that non-Hispanic black children are 1.7 times as likely as non-Hispanic white children to be reported to have respiratory problems by age three, while the risk for Hispanic children is similar to that of non-Hispanic white children. Birth weight is also very strongly related to respiratory problem risk. Specifically, children born at very low weights (500–1499 g) have four times the odds of having respiratory problems of heavier children. Statistical controls for birth weight decrease the black-white differential by about 20%, while additional controls for sociodemographic factors reduce the race differential by an additional 35%. Finally, the net effect of birth weight is different for black and white children: whereas birth weight affects the risk of respiratory problems for black children only at low weights (<1500 g), it remains an important predictor of excess risk for white children up to 3500 g.

     

ON A STOCHASTIC MODEL FOR AN IRREVERSIBLE SYSTEM OF COMPARTMENTS

A continuous time stochastic model for an irreversible system of kcompartments with nonhomogeneous Poisson inputs is considered. The model allows an arbitrary residence time for each of the compartments. Individuals may enter the system through any compartment and may depart from the system via any compartment.     

An Exploratory Study of the Effects of Teacher Attractiveness on Undergraduates' Perceptions of Teacher–Student Sexual Involvement

This study explored whether the attractiveness of a teacher affected perceptions of teacher sexual misconduct. Respondents (120 female and 108 male undergraduates) read scenarios depicting teacher sexual misconduct varied by gender dyad (male teacher–female student and female teacher–male student) and two levels of attractiveness (very attractive or ordinary looking). The attractiveness of the teacher had little impact on respondents' perceptions. Significant interactions emerged on most variables between respondent gender and gender dyad. Specifically, male respondents tended to view the female teacher–male student dyad as less negative than the male teacher–female student dyad. Female respondents generally did not make a distinction based on the gender dyad.