Public response to the 1970 census: A Wisconsin survey

The 1970 census included numerous procedural innovations, of which the most important was the use of mail-out/mail-back techniques. A statewide survey of Wisconsin households (conducted in May and June, 1970) included questions designed to elicit information on the degree of cooperation rendered, ease of comprehension of the form, possible objectionable items on the census, whether or not contacts were made by enumerators, and respondent judgments of the adequacy of enumerators’ performance. The results indicate that Wisconsin respondents tended to comply with census procedures, that they found very little difficulty in filling out the mailed forms, and that they regarded the census enumerators as doing a “good job” in most cases.     

The impact of childcare responsibilities on part-time or single fathers

The study described in this article was designed to determine the effects of childcare involvement on the lifestyles of fathers with young children. One hundred and twenty-seven separated or divorced men were interviewed. Their parental responsibilities ranged from full custody or joint custody to weekends or monthly visits. For the most part these men represented a middle class, highly educated, urban population. The primacy of work and occupational roles in the lives of the fathers was challenged by the contractual obligations of parenting. Fathers who spent time with their children had the opportunity to work out some crisis issues of divorce such as control, interdependence, and self-image. It was found that postdivorce parenting is an important source of resocialization for men in areas of work orientation and personal relationships. It is expected that this new functioning will have positive effects on the structure of reconstituted (i.e., second marriage) families.     

Resident and family perspectives on assisted living

This research describes and compares the relative importance residents and family members place on attributes of the environment, the programs, and the policies of assisted living; describes their satisfaction with these features; and identifies factors associated with congruence between residents' and family members' ratings of importance and satisfaction. Both residents and their family members had high importance and satisfaction ratings. Family members gave the assisted living setting lower satisfaction ratings on all features than did residents. Congruence ranged from 34% to 71% for importance items and from 29% to 63% for satisfaction. Female residents, affectionate family relationships, and residing in an AL owned by a chain were positively associated with congruence on importance items, while resident and family education, resident income, and family involvement were negatively associated with congruence on importance items. For congruence on satisfaction items, having an affectionate relationship was positively associated and higher ADL dependency, more family involvement at the facility, and family members who viewed the facility as a safe place were negatively associated with congruence. This study makes a major stride forward because cognitively intact residents' perspectives are compared and contrasted with their own family members' perspectives, thus showing that residents and family members are two distinct groups, each with a unique set of preferences.     

On extending bock's model of logistic regression in the analysis of categorical data

A general class of multiple logistic regression models is reviewed and an extension is proposed which leads to restricted maximum likelihood estimates of model parameters. Examples of thegeneral model are given, with an emphasis placed on the interpretation of the parameters in each case.     

Accent on Teaching Materials

Estimation of covariance components in the multivariate random-effect model with nested covariance structure is discussed. There are two covariance matrices to be estimated, namely, the between-group and the within-group covariance matrices. These two covariance matrices are most often estimated by forming a multivariate analysis of variance and equating mean square matrices to their expectations. Such a procedure involves taking the difference between the between-group mean square and the within-group mean square matrices, and often produces an estimated between-group covariance matrix that is not nonnegative definite. We present estimators of the two covariance matrices that are always proper covariance matrices. The estimators are the restricted maximum likelihood estimators if the random effects are normally distributed. The estimation procedure is extended to more complicated models, including the twofold nested and the mixed-effect models. A numerical example is presented to illustrate the use of the estimation procedure.     

Accent on Teaching Materials: Notices and Reviews of Important Teaching Materials

This article examines the probabilities of outcomes from rolling dice with the dimension 1 × 1 × r for various values of r. Experiments were conducted by school students and university students. The results of the experiments are given and the probabilities examined using a generalized linear model. Notes are also made about the value of the experiment in teaching the groups of students.     

Topics in Microbial Risk Assessment: Dynamic Flow Tree Process

Microbial risk assessment is emerging as a new discipline in risk assessment. A systematic approach to microbial risk assessment is presented that employs data analysis for developing parsimonious models and accounts formally for the variability and uncertainty of model inputs using analysis of variance and Monte Carlo simulation. The purpose of the paper is to raise and examine issues in conducting microbial risk assessments. The enteric pathogen Escherichia coli O157:H7 was selected as an example for this study due to its significance to public health. The framework for our work is consistent with the risk assessment components described by the National Research Council in 1983 (hazard identification; exposure assessment; dose-response assessment; and risk characterization). Exposure assessment focuses on hamburgers, cooked a range of temperatures from rare to well done, the latter typical for fast food restaurants. Features of the model include predictive microbiology components that account for random stochastic growth and death of organisms in hamburger. For dose-response modeling, Shigella data from human feeding studies were used as a surrogate for E. coli O157:H7. Risks were calculated using a threshold model and an alternative nonthreshold model. The 95% probability intervals for risk of illness for product cooked to a given internal temperature spanned five orders of magnitude for these models. The existence of even a small threshold has a dramatic impact on the estimated risk.