Binary action based estimation of propensities

An observer is to make inference statements about a quantityp, called apropensity and bounded between 0 and 1, based on the observation thatp does or does not exceed a constantc. The propensityp may have an interpretation as a proportion, as a long-run relative frequency, or as a personal probability held by some subject. Applications in medicine, engineering, political science, and, most especially, human decision making are indicated. Bayes solutions for the observer are obtained based on prior distributions in the mixture of beta distribution family; these are then specialized to power-function prior distributions. Inference about logp and log odds is considered. Multiple-action problems are considered in which the focus of inference shifts to theprocess generating the propensitiesp, both in the case of a process parameter known to the subject and unknown. Empirical Bayes techniques are developed for observer inference aboutc when is known to the subject. A Bayes rule, a minimax rule and a beta-minimax rule are constructed for the subject when he is uncertain about.This research was partially supported by the Defense Advanced Research Projects Agency of the Department of Defense and was monitored by ONR under Contract No. N00014-77-C-0095. Any opinions, findings, conclusions or recommendations expressed herein are those of the author and do not necessarily reflect the views of the Defense Advanced Research Projects Agency, the Office of Naval Research, or Carnegie-Mellon University.     

In support of extreme groups design for studying masculinity-femininity and intelligence

Humphreys (this issue) reanalyzed the data of Welsh and Baucom (1977) and stated that their conclusions were unsupportable. Humphreys's criticisms are inappropriate since his findings are based upon a measure of masculinity-femininity (M-F) which is different from the previous approach and based upon a sample which is somewhat different. Thus he addresses issues which are inconsistent with Welsh and Baucom's focus. Finally, Humphreys's insistence on correlational analysis to the exclusion of extreme groups design is viewed as inappropriately limiting.     

The impact of a stillbirth on a marriage

The crippling consequences on family life of the failure to mourn a stillbirth adequately are demonstrated in a vulnerable couple. They were helped by brief, planned, focal, conjoint marital psychotherapy which is described.     

The effects of attitudes toward feminism and perceived feminism on physical attractiveness ratings

The effects of perceived feminism of females and attitudes toward feminism of males on physical attractiveness ratings of female stimulus persons (SPs) were investigated, using two alternative hypotheses: first, SPs who are perceived as feminists would be rated as less attractive than SPs not perceived as feminists; second, profeminist males would rate profeminist women as more attractive than nonfeminist women, and vice versa for nonfeminist males. Seventy-six male college students responded to the Smith-Ferree-Miller questionnaire on attitudes toward feminism and then rated on an 8-point scale of attractiveness 6 photographs of female SPs which had been selected from a pretested sample of 18 photographs. Perceived feminism of the SPs in the photographs was manipulated by presenting the raters with four attitude statements, two of which related to feminism. Although there were no main effects for the two variables, significant interaction did occur, confirming the second (attitude similarity) hypothesis. A negative halo effect, as opposed to a belief in the unattractiveness of feminists, was offered as an explanation of the difference in results between this study and the Goldberg, Gottesdiener, and Abramson (1975) study.     

The role of syntactic context in word recognition

This study examines the role of syntactic information in word recognition. Subjects made a word-nonword decision regarding a target string that was preceded by a syntactically appropriate word, a semantically related word, or an unrelated word. In Experiment 1, with syntactic and semantic trials assigned to separate blocks, syntactically and semantically appropriate context significantly reduced lexical decision for subsequent target words, compared with unrelated contexts. In Experiment 2, the syntactically and semantically primed trials were either blocked separately or mixed within the same block. Significant syntactic and semantic effects were both observed in the blocked condition, but only the semantic effect was obtained in the mixed condition     

Use of a statistical significance criterion in drawing inferences about hemispheric dominance for language function from dichotic listening data

A dichotic listening test (composed of VCV nonsense syllables) was administered to 31 right-handed subjects. A χ² statistical significance criterion was then applied to the resulting ear differences in subjects. Fifteen subjects had ear differences significant at the p < .10 levels. Of these, 14 had right-ear advantages, an incidence consistent with the incidence of left-hemisphere language dominance derived from neurological data. Incidence for the total group of 31 subjects, however, showed the overabundance of left-ear-superior protocols typical of studies that report ear-dominance scores with no statistical criterion.     

Latency differences in monoptic and dichoptic shape and color decision making

Past research based on the McCollough effect and efficacy of chromatic cues in stereopsis suggests that color information is difficult to process binocularly as compared to form information. This study evaluates this proposition using a reaction time paradigm. Subjects decided whether two simultaneous visual stimuli were the same in shape or color. With presentation to the same eye, color reaction times led shape latencies. Presenting one target to one eye and one to the other slowed color times. Delaying one target by 500 msec yielded dichoptic and monoptic color decisions faster than shape. The results are related to the relationships of color and contrast pathways and possible differences in binocular rivalry.