Distribution-free tests of stochastic dominance for small samples

One variable is said to “stochastically dominate” another if the probability of observations smaller than x is greater for one variable than the other, for all x. Inferring stochastic dominance from data samples is important for many applications of econometrics and experimental psychology, but little is known about the performance of existing inferential methods. Through simulation, we show that three of the most widely used inferential methods are inadequate for use in small samples of the size commonly encountered in many applications (up to 400 observations from each distribution). We develop two new inferential methods that perform very well in a limited, but practically important, case where the two variables are guaranteed not to be equal in distribution. We also show that extensions of these new methods, and an improved version of an existing method, perform quite well in the original, unlimited case.     

Detecting Orientation of a Surface: The Rectangularity Postulate and Primary Depth Cues

Computational metaphors for determining the orientation of planar surfaces represented in line drawings have exploited a postulate that often surfaces are rectangular. Previous research implies that people follow such logic with real surfaces in ecological viewing. However, this research is problematic methodologically and some research does not directly address the issue. The stimuli used in this study were rectangular and trapezoidal; the latter shape was used to mislead with regard to orientation under the rectangularity postulate. Viewing conditions were monocular and binocular, with and without observer movement. The results suggest that the rectangularity postulate was important under stationary monocular viewing but diminished with movement and was not apparent during binocular viewing. General arguments about the importance of secondary depth cues in ecological viewing are developed.     

A Test of Order-Constrained Hypotheses for Circular Data With Applications to Human Movement Science

Researchers studying the movements of the human body often encounter data measured in angles (e.g., angular displacements of joints). The evaluation of these circular data requires special statistical methods. The authors introduce a new test for the analysis of order-constrained hypotheses for circular data. Through this test, researchers can evaluate their expectations regarding the outcome of an experiment directly by representing their ideas in the form of a hypothesis containing inequality constraints. The resulting data analysis is generally more powerful than one using standard null hypothesis testing. Two examples of circular data from human movement science are presented to illustrate the use of the test. Results from a simulation study show that the test performs well.     

Occupational Therapy Intervention in the Treatment of Alcoholics

The first section of this article will provide the rationale for all occupational therapists to learn extensively about the isease of alcoholism regardless of area of practice or type of agency where employed. It will offer su estions on how this learning can take place. The second section will take an historic look at occupational therapy literature documenting the use of occupational therapy in alcoholism rehabilitation from 1941 to the present. It will describe modalities currently being used by occupational therapists in alcoholism rehabilitation and discuss expansion of occupational therapy in this practice area.     

Strategy instruction for writing composition at school and at home

Abstract

The objectives of this study are 1) to analyze the effectiveness of a writing composition intervention program aimed to increase children's writing performance and other personal variables; 2) to analyze whether implementation in the environment (school and home) or responsible figures (parents and teachers) produced different effects in program effectiveness; and 3) to check whether increasing parental involvement in doing homework was sufficient to improve children's outcomes or whether prior family training is required to enable them to be efficient. The sample consisted of 112 students (5th-6th grade) and their families. 26 of them made up the EFP group (mothers implementing a writing program), 25 of them were assigned to the PAD group (mothers increasing help with writing homework), 35 to the PRO group (teachers applying a writing program) and 26 to the OC group (ordinary curriculum). We analyze the results and present and discuss our conclusions.     

A quality assurance programme for psychotherapy — The finnish experience

In many respects the status of psychotherapy in public health-care systems is similar to that of alternative medicine. The roots of training are outside universities. Legitimation and public funding have been non-existent or insufficient as compared with other fields of health care. Also a great deal of mysticism is attached to both. It is therefore relevant to study the role of psychotherapy from the frame of reference given by research into alternative health care.

Formal health care is characterised by (1) legalised status, (2) access to public funding and (3) integration in the formal medical curriculum. On the other hand there are several treatment philosophies which remain as outsiders from the point of view of formal health care. Informal health care approaches are characterised by (1) lack of legalised status, (2) no access to public funding and (3) no integration in the medical curriculum. Alternative medicine is a term usually attached to forms of informal health care like acupuncture, Spa-culture etc.

Psychotherapy in the public health sector lies somewhere between formal and informal health care. While it has no legalised status, anyone may call himself ‘psychotherapist’. Its definition remains obscure and its public accountability poor.

In this paper I have tried to show how one country — Finland — has tried to grapple with this problem as it attempted to set up psychotherapy services whose quality could be properly monitored — ‘Quality Assurance’ — allowing for public accountability. Now that psychotherapy is well established as a valuable treatment in the field of mental health it is possible to consider future expansion as a cost-effective way to improve the general mental health of the country.     

It is never the right time: How to help a mother to separate from her young child

In this paper I have described a short-psychotherapy treatment with a mother, a 3-year-old girl, and occasionally a father, over the difficulty in separating and settling down at nursery. The mother's unresolved mourning for the early miscarriage of her second baby was one important factor. She held on to the company and comfort provided by the little girl, who had become the vessel of maternal projections. Filled with Poppy's projections, the mother had also felt unable to withstand and process them. Mr Green was a conflictual element in the family, rather than a supportive husband and father, and Poppy's care and problems were left with the mother. Nine sessions unblocked the situation and allowed Poppy to settle down at a private nursery.     

Suicide and masochism: The evolving relationship between guilt,suffering, self-attack and suicide

Masochism is a complex and intriguing phenomenon. Self-attack may serve many purposes. Some patients suffer through harsh self-criticism, bodily harm, or even tormenting thoughts of death, without actually killing themselves. Some of these patients ultimately may go on to die by suicide, but for many, the self-torturing aspect may exist independently in acute or chronic forms. This paper addresses the complex relationship between masochism and suicide as two separate yet interconnected phenomena.     

Administering Quantitative Instruments With Qualitative Interviews: A Mixed Research Approach

The authors demonstrate how collecting quantitative data via psychometrically sound quantitative instruments during the qualitative interview process enhances interpretations by helping researchers better contextualize qualitative findings, specifically through qualitative dominant crossover mixed analyses. They provide an example of this strategy, whereby a baseline was established using a quantitative scale and normative data to help interpret qualitative interviews, resulting in what they call a mixed methods interview. Philosophical and practical implications are discussed.     

Data Collection in a Flat World: The Strengths and Weaknesses of Mechanical Turk Samples

Mechanical Turk (MTurk), an online labor system run by Amazon.com, provides quick, easy, and inexpensive access to online research participants. As use of MTurk has grown, so have questions from behavioral researchers about its participants, reliability, and low compensation. In this article, we review recent research about MTurk and compare MTurk participants with community and student samples on a set of personality dimensions and classic decision‐making biases. Across two studies, we find many similarities between MTurk participants and traditional samples, but we also find important differences. For instance, MTurk participants are less likely to pay attention to experimental materials, reducing statistical power. They are more likely to use the Internet to find answers, even with no incentive for correct responses. MTurk participants have attitudes about money that are different from a community sample's attitudes but similar to students' attitudes. Finally, MTurk participants are less extraverted and have lower self‐esteem than other participants, presenting challenges for some research domains. Despite these differences, MTurk participants produce reliable results consistent with standard decision‐making biases: they are present biased, risk‐averse for gains, risk‐seeking for losses, show delay/expedite asymmetries, and show the certainty effect—with almost no significant differences in effect sizes from other samples. We conclude that MTurk offers a highly valuable opportunity for data collection and recommend that researchers using MTurk (1) include screening questions that gauge attention and language comprehension; (2) avoid questions with factual answers; and (3) consider how individual differences in financial and social domains may influence results. Copyright © 2012 John Wiley & Sons, Ltd.