Correlations,trends and potential biases among publicly accessible web-based student evaluations of teaching: a large-scale study of RateMyProfessors.com data

Student evaluations of teaching are widely adopted across academic institutions, but there are many underlying trends and biases that can influence their interpretation. Publicly accessible web-based student evaluations of teaching are of particular relevance, due to their widespread use by students in the course selection process and the quantity of data available for analysis. In this study, data from the most popular of these websites, RateMyProfessors.com, is analysed for correlations between measures of instruction quality, easiness, physical attractiveness, discipline and gender. This study of 7,882,980 RateMyProfessors ratings (from 190,006 US professors with at least 20 student ratings) provides further insight into student perceptions of academic instruction and possible variables in student evaluations. Positive correlations were observed between ratings of instruction quality and easiness, as well as between instruction quality and attractiveness. On average, professors in science and engineering disciplines have lower ratings than in the humanities and arts. When looking at RateMyProfessors as a whole, the effect of a professor’s gender on rating criteria is small but statistically significant. When analysing the data as a function of discipline, however, the effects of gender are significantly more pronounced, albeit more complex. The potential implications are discussed.     

Changes in swimming technique during time to exhaustion at freely chosen and controlled stroke rates

The aim of this study was to assess technical changes during constrained swimming in time-to-exhaustion tests. Ten swimmers of national standard performed a maximal 400-m front crawl and two sets of exhaustion tests at 95%, 100%, and 110% of mean 400-m speed. In the first set (free), swimmers had to maintain their speeds until exhaustion and mean stroke rate was recorded for each test. In the second set (controlled), the same speed and individual corresponding stroke rate were imposed. The durations of the exhaustion tests, relative durations of the stroke phases, and arm coordination were analysed. For each speed in the "controlled" set, the exhaustion tests were shorter. Moreover, variables were consistent, suggesting a stabilization of stroke technique. Under the free condition, stroke rate increased to compensate for the decrease in stroke length. At the same time, swimmers reduced the relative duration of their non-propulsive phases in favour of the propulsive phases. Thus, swimmers changed their arm coordination, which came close to an opposition mode. These two constraints enable swimmers both to maintain their stroking characteristics and develop compensatory mechanisms to maintain speed. Moreover, stroke rate can be seen as a useful tool for controlling arm technique during paced exercise.     

Relations between EFL teachers’ formal knowledge of grammar and their in-action mental models of children's minds and learning

We studied the relations between English as a foreign language teachers’ grammar knowledge and their in-action mental models (MMs) of children's minds and learning. The grammar knowledge we examined was English wh-constructions. A total of 74 teachers completed an assessment task and were classified to have deep, intermediate or shallow knowledge. Ten teachers (five with deep and five with shallow level) were videotaped teaching wh-questions. The data were analysed qualitatively to determine the teachers’ MM, and then quantitatively to test similarities/differences in their MM's expression. The findings revealed an identical MM among all teachers that is expressed differently as a function of knowledge level.     

Impact of childhood abuse history on psychological symptoms among male and female soldiers in The U.S. Army

The long-term psychological effects of four different types of childhood maltreatment were examined among 1,072 male and 305 female soldiers on active duty in the United States Army. The predictor variables included four subscales from the Childhood Trauma Questionnaire (CTQ)—(1) physical-emotional abuse, (2) sexual abuse, (3) emotional neglect, and (4) physical neglect. An additional sexual abuse variable based on the four screening questions developed by Finkelhor, Hotaling, Lewis, and Smith (1990) was also included. Outcome was measured by the Brief Symptom Inventory and a dissociation scale developed by Briere and Runtz (1988). MANOVAs were conducted for each outcome measure. Physical-emotional abuse contributed to most of the effects. However, sexual abuse contributed additional significant effects to all of the subscales. In general, males and females showed similar outcomes, but certain gender differences were noted.     

Modified Reciprocal Teaching in a Regular Classroom

This study was designed to increase reading comprehension and academic achievement of students through the use of a modified reciprocal teaching program. Modified reciprocal teaching involved small groups of students working together to read and comprehend a portion of text. The students took turns “teaching” these groups by assisting the rest of the group in selecting key words and phrases, summarizing, questioning, clarifying, and predicting. Students were randomly assigned to one of three seventh-grade regular education social studies classes. One class used modified reciprocal teaching twice a week for 8 weeks. The other two classes received a traditional instructional program. All classes were taught by the same teacher. Significant differences included higher scores on comprehension tests and writing samples, improvement in second-quarter social studies grades, and better conduct records for students who participated in modified reciprocal teaching. Several explanations for the superior performance of the modified reciprocal teaching group are hypothesized.     

诺贝尔奖得主寄语中国未来的科学发展

5月25—26日,在纪念国家自然科学基金委员会成立20周年的“21世纪科学前沿与中国的机遇”高层论坛上,6位诺贝尔奖得主做了精彩报告。在对中国科学的未来发展寄予殷切期望的同时,他们也对中国的科技政策提出了具有启发性的建议。现摘编如下:诺贝尔化学奖得主、美国耶鲁大学教授S     

Confusion and complex learning during interactions with computer learning environments

Folk wisdom holds that being confused is detrimental to learning. However, research on emotions and learning suggest a somewhat more complex relationship between confusion and learning outcomes. In fact, it has been proposed that impasses that trigger states of cognitive disequilibrium and confusion can create opportunities for deep learning of conceptually difficult content. This paper discusses four computer learning environments that either naturally or artificially induce confusion in learners in order to create learning opportunities. First, an Intelligent Tutoring System called AutoTutor that engenders confusion through challenging problems and vague hints is described. The remaining three environments were specifically designed to induce confusion through a number of different interventions. These interventions include device breakdowns, contradictory information, and false feedback. The success and limitations of confusion induction and the impact of confusion resolution on learning are discussed. Potential methods to help learners productively manage their confusion instead of being hopelessly confused are also discussed.     

Dynamics of affective states during complex learning

We propose a model to explain the dynamics of affective states that emerge during deep learning activities. The model predicts that learners in a state of engagement/flow will experience cognitive disequilibrium and confusion when they face contradictions, incongruities, anomalies, obstacles to goals, and other impasses. Learners revert into the engaged/flow state if equilibrium is restored through thought, reflection, and problem solving. However, failure to restore equilibrium as well as obstacles that block goals trigger frustration, which, if unresolved, will eventually lead to boredom. The major hypotheses of the model were supported in two studies in which participants completed a 32-35 min tutoring session with a computer tutor. Their affective states were tracked at approximately 110 points in their tutoring sessions via a retrospective affect judgment protocol. Time series analyses confirmed the presence of confusion-engagement/flow, boredom-frustration, and confusion-frustration oscillations. We discuss enhancements of the model to address individual differences and pedagogical and motivational strategies that are inspired by the model.     

The basis of liability for broadcasting defamatory remarks

In an article that appeared in Winter 1958–1959 issue of the Journal of Broadcasting, Profesor Gordon Greb added a new contender for the title of “oldest station in the nation.”; As a result, KQW has joined KDKA, WHA and WWJ as a candidate for the honor of primacy in American radio broadcasting. Although Greb's article created as much interest and controversy as any that has appeared in the Journal, it did not—and could not—still the confidence of the other claimants.

In the instant article, Mr. R. Franklin Smith does the field of historical radio research a service by setting forth, for the first time, a logical set of criteria by which to judge these conflicting claims. To illustrate he has utilized early records of WHA. Using these criteria, it is shown that WHA cannot claim to have been a true broadcasting station before the latter part of 1920. Comparison of the claims of the several contenders is outside the scope of this article. However, it would be extremely interesting if these criteria were applied to the conflicting claims by persons having access to the detailed station records and other data necessary for thorough analysis.

Perhaps Mr. Smith has given us the impetus and the tools necessary for determining which station really was the “oldest in the nation.”