Covariance structure analysis in experimental research: Comparing two word translation models

Covariance structure analysis is a statistical technique in which a theoretical model, or a covariance structure, is constructed, and the covariances predicted by the theoretical model are compared with those of the observed data. The adequacy of the model in reproducing the sample covariances is reflected by estimates of the parameters of the model and measures indicating the goodness of fit. Covariance structure analysis is frequently used for analyzing data obtained in nonexperimental or quasiexperimental research, but is seldom employed in experimental research. In this paper, the applicability of this technique in experimental research is discussed and illustrated by covariance structure analysis studies in which two models for word translation—the symmetrical model and the asymmetrical model—are described, refined, and contrasted.     

Statistical inference based on latent ability estimates

The quality of approximations to first and second order moments (e.g., statistics like means, variances, regression coefficients) based on latent ability estimates is being discussed. The ability estimates are obtained using either the Rasch, or the two-parameter logistic model. Straightforward use of such statistics to make inferences with respect to true latent ability is not recommended, unless we account for the fact that the basic quantities are estimates. In this paper true score theory is used to account for the latter; the counterpart of observed/true score being estimated/true latent ability. It is shown that statistics based on the true score theory are virtually unbiased if the number of items presented to each examinee is larger than fifteen. Three types of estimators are compared: maximum likelihood, weighted maximum likelihood, and Bayes modal. Furthermore, the (dis)advantages of the true score method and direct modeling of latent ability is discussed.     

Activity/nonactivity and the group therapist: “Don't just do something,sit there”

The abstinent stance of psychoanalytically-oriented clinicians is often confused with passivity or coldness toward the patient or the group. Given the current move toward more active, shorter-term treatment, this paper offers a reaffirmation of the value of the abstinent analytic stance. The theoretical rationale for the technique is reviewed, and some specific arguments are made to illustrate the continuing importance of the method in the treatment of patients in psychodynamic group psychotherapy.Reputed to be Adlai Stevenson's advice to President John F. Kennedy during the Cuban Missile Crisis.     

Better Candidates Fly Fewer Training Hours: Another Time Testing Pays Off

The relationship between Pilot Candidate Selection Method (PCSM) scores and the number of flying training hours required to complete United States Air Force Undergraduate Pilot Training (UPT) was investigated on a sample of 1,082 graduates. This was done to demonstrate that ability testing has real world correlates and that cost savings accrued as a result of ability testing. The criterion ‘extra flying hours’ was computed by subtracting each student's cumulative flying hours from the sample mean. The correlations (corrected for range restriction) between PCSM scores and primary and advanced flying training extra hours were ?0.206 and ?0.270, respectively. Demonstrating that UPT graduates with higher PCSM scores required fewer flying hours to complete training facilitates the estimation of the cost avoidance achieved by ability tests.     

Pictorial surface attitude and local depth comparisons

We measured local surface attitude for monocular pictorial relief and performed pairwise depthcomparison judgments on the same picture. Both measurements were subject to internal consistency checks. We found that both measurements were consistent with a relief (continuous pictorial surface) interpretation within the session-to-session scatter. We reconstructed the pictorial relief from both measurements separately, and found results that differed in detail but were quite similar in their basic structures. Formally, one expects certain geometrical identities that relate range and attitude data. Because we have independent measurements of both, we can attempt an empirical verification of such geometrical identities. Moreover, we can check whether the statistical scatter in the data indicates that, for example, the surface attitudes are derivable from a depth map or vice versa. We estimate that pairwise depth comparisons are an order of magnitude less precise than might be expected from the attitude data. Thus, the surface attitudes cannot be derived from a depth map as operationally defined by our methods, although the reverse is a possibility.     

The influence of height and key on the perceptual similarity of transposed melodies

In two experiments, the perceptual similarity between a strong tonal melody and various transpositions was investigated using a paradigm in which listeners compared the perceptual similarity of a melody and its transposition with that of the same melody and another transposition. The paradigm has the advantage that it provides a direct judgment regarding the similarity of transposed melodies. The experimental results indicate that the perceptual similarity of a strong tonal melody and its transposition is mainly determined by two factors: (1) the distance on the height dimension between the original melody and its transposition (pitch distance), and (2) the distance between keys as inferred from the circle of fifths (key distance). The major part of the variance is explained by the factor pitch distance, whereas key distance explains only a small part.     

PHILOSOPHY OF MEDICAL PRACTICE: A DISCURSIVE APPROACH

In spite of the seminal work A Philosophical Basis of Medical Practice, the debate on the task and goals of philosophy of medicine still continues. From an European perspective it is argued that the main topics dealt with by Pellegrino and Thomasma are still particularly relevant to medical practice as a healing practice, while expressing the need for a philosophy of medicine. Medical practice is a discursive practice which is highly influenced by other discursive practices like science, law and economics. Philosophical analysis of those influences is needed to discern their effect on the goals of medicine and on the ways in which the self-image of man may be changed. The nature of medical practice and discourse itself makes it necessary to include different philosophical disciplines, like philosophy of science, of law, ethics, and epistemology. Possible scenario's of euthanasia and the human genome project in the USA and Europe are used to exemplify how philosopy of medicine can contribute to a realistic understanding of the problems which are related to the goals of medicine and health care.     

The Many Meanings of Religiousness: A Policy-Capturing Approach

ABSTRACT This article reports the results of two policy-capturing studies that investigated individual differences in the meaning of religiousness. Policy capturing requires judges to respond to a large number of hypothetical scenarios or profiles that differ along a number of potentially relevant cues or attributes. Multiple regression analyses are then conducted to ascertain which cues are influencing each judge's responses. For both studies, 100 profiles were developed describing hypothetical individuals who differed on 10 cues thought to influence perceptions of religiousness (e.g., church attendance, doctrinal orthodoxy), and judges rated each profile on a 9-point religiousness scale. Judges in Study 1 were 27 Roman Catholic and Protestant college students. Policy-capturing analyses identified clear individual differences in the cues that afifected judgments of religiousness, and in the self-insight of the students into their personal policies. To test whether these findings reflected the youth or religious maturity of the sample, the study was replicated with a sample of 22 Catholic and Protestant clergy. Similar results were found in Study 2. In both samples, individual policy capturing did a significantly better job of predicting judgments of religiousness than did self-described policies or policies created by averaging across judges. Together these findings underscore the diversity of religious meanings and the need for further idiographic investigations in the psychology of religion.