Optimum split-half reliabilities for the Rorschach: projective techniques are more reliable than we think

A new technique for optimizing split-half reliability estimates yielded substantial and comparable increases in indexes of internal reliability for some major Rorschach variables across two diverse samples. Practical suggestions for applying this method to other projective tests were advanced. The inadvisability of computing odd-even reliability coefficients without regard to split-half distributional anomalies is addressed.     

The effects of location,orientation, and cumulation of boxes in the Baldwin illusion

Three experiments were conducted on variants of the Baldwin illusion. Experiment 1 showed that placing a box on each side of the standard line produced a larger illusion than placing both boxes on the same side of the line. These results failed to support the assimilation theory proposed by Brigell, Uhlarik, and Goldhorn (1977). In Experiment 2, the side of a rectangular box was varied when that side was either parallel or perpendicular to the standard line. The parallel rectangle produced a function that was similar to the one found with the classical Baldwin figure, but the perpendicular boxes produced a monotonically decreasing function with a reversal of illusion evident at the large sizes. The latter function did not support any version of the assimilation theory. The findings of Experiment 3 replicated previous findings that showed that cumulating contours as box size increased had no effect on the illusion. These findings explain two longstanding puzzles about the Müller-Lyer illusion: why a multifinned form is not the sum of its single-finned parts and why the shrinkage form produces a smaller effect than does the expansion form.     

On the estimation of parameters in latent structure analysis

In this note, we describe the iterative procedure introduced earlier by Goodman to calculate the maximum likelihood estimates of the parameters in latent structure analysis, and we provide here a simple and direct proof of the fact that the parameter estimates obtained with the iterative procedure cannot lie outside the allowed interval. Formann recently stated that Goodman's algorithm can yield parameter estimates that lie outside the allowed interval, and we prove in the present note that Formann's contention is incorrect.This research was supported in part by Research Contract No. NSF SOC 76-80389 from the Division of the Social Sciences of the National Science Foundation. The author is indebted to C. C. Clogg for helpful comments and for the numerical results reported here (see, e.g., Table 1).     

The effect on endurance of a verbal commitment versus exhortation,task information,and monetary incentives

Fifty-six male students worked to better their initial endurance scores on a second trial. Those who had formed a verbal commitment to do so performed significantly better than those offered a monetary incentive, exhortations to try hard, or information on how to deal with fatigue cues. The power of the “contract” in this study appears to be due not to additional specificity of information or to experimenter demands but more directly to the reinforcement value of having made a commitment in the presence of another.     

Classes and collections: Principles of organization in the learning of hierarchical relations

This study demonstrates that children tend to distort class inclusion relations (e.g., the relation of oaks to trees) into the part-whole structure of collections (e.g., the relations of oaks to a forest). Children aged 6 to 17 were taught novel class inclusion hierarchies, analogous to the relation between oaks, pines, and trees. In one condition, the class inclusion relations were taught by ostensive definition alone, e.g., stating “These are trees” while pointing to trees and, “These are oaks” while pointing to oaks. in the second condition, children were additionally told what would be analogous to “Oaks and pines are two kinds of trees”. With this additional information to constrain their interpretation, even the youngest children correctly interpreted the relation as class inclusion. In contrast, with limited information, children as old as 14 erroneously imposed a collection structure on the inclusion hierarchies. They would deny, for example, that any single tree was a tree (as they should of they thought “tree” meant “forest”), and would pick up several trees despite being asked for a tree. The results indicated that the part-whole structure of collections is simpler to establish and maintain than the structure of inclusion.     

DIMENSIONS OF WORK OUTCOMES: A MULTIDIMENSIONAL SCALING APPROACH

There exists a need for basic research on the nature of work outcomes, to facilitate integration of theory and results and to aid in the sampling of outcomes for research and evaluation. Existing research, primarily using factor analysis, has led to a hierarchical model, with numerous sub-factors grouped under the major factors of "intrinsic" and "extrinsic." Recent research, however, has shown that industrial/organizational psychologists do not agree on the definition of intrinsic and extrinsic. It is argued that a more useful approach is a dimensional model, which allows each work outcome to be described by a set of values on multiple dimensions. A multidimensional scaling analysis of 21 outcomes yields a latent structure with three dimensions: value attached to the outcome by society, level of psychological need met, and extent to which the outcome is inherent in the work itself. Implications for the sampling of outcomes and integration of different literature are discussed. The results suggest that a multidimensional model of work outcomes is more useful than a categorical approach built on the intrinsic/extrinsic dichotomy.