Visual knowledge discovery and machine learning for investment strategy

Knowledge discovery is an important aspect of human cognition. The advantage of the visual approach is in opportunity to substitute some complex cognitive tasks by easier perceptual tasks. However for cognitive tasks such as financial investment decision making this opportunity faces the challenge that financial data are abstract multidimensional and multivariate, i.e., outside of traditional visual perception in 2D or 3D world. This paper presents an approach to find an investment strategy based on pattern discovery in multidimensional space of specifically prepared time series. Visualization based on the lossless Collocated Paired Coordinates (CPC) plays an important role in this approach for building the criteria in the multidimensional space for finding an efficient investment strategy. Criteria generated with the CPC approach allow reducing/compressing space using simple directed graphs with beginnings and the ends located in different time points. The dedicated subspaces constructed for time series include characteristics such as Bollinger Band, difference between moving averages, changes in volume etc. Extensive simulation studies have been performed in learning/testing context. Effective relations were found for one-hour EURUSD pair for recent and historical data. Also the method has been explored for one-day EURUSD time series n 2D and 3D visualization spaces. The main positive result is finding the effective split of a normalized 3D space on 4 × 4 × 4 cubes in the visualization space that leads to a profitable investment decision (long, short position or nothing). The strategy is ready for implementation in algotrading mode.     

Study preferences for exemplar variability in self-regulated category learning

Increasing exemplar variability during category learning can enhance classification of novel exemplars from studied categories. Four experiments examined whether participants preferred variability when making study choices with the goal of later classifying novel exemplars. In Experiments 1–3, participants were familiarised with exemplars of birds from multiple categories prior to making category-level assessments of learning and subsequent choices about whether to receive more variability or repetitions of exemplars during study. After study, participants classified novel exemplars from studied categories. The majority of participants showed a consistent preference for variability in their study, but choices were not related to category-level assessments of learning. Experiment 4 provided evidence that study preferences were based primarily on theoretical beliefs in that most participants indicated a preference for variability on questionnaires that did not include prior experience with exemplars. Potential directions for theoretical development and applications to education are discussed.     

The roles of encoding strategies and retrieval practice in test-expectancy effects

We investigated whether expectations for different kinds of memory tests induce qualitatively different encoding strategies. In Experiment 1, participants studied four lists of words and after each list completed a cued-recall test that contained either all semantic or all orthographic cues so as to build up an expectancy for receiving the same type of test for the fifth critical study list. To rule out that the test-expectancy effects in Experiment 1 were due to differences in retrieval practice, in Experiment 2, participants received three practice tests each for both cue-types. Participants’ test expectancy for all lists was induced by telling them before each list the type of cue they would receive for the upcoming study list. In both experiments, the critical test contained both expected and unexpected cues. In Experiment 1, participants who expected semantic cues had better recall to the semantic cues than to the orthographic cues and vice versa for those who expected orthographic cues. However, in Experiment 2, there was no effect of test expectancy. These findings suggest that the test-expectancy effects in Experiment 1 were due to more retrieval practice on the expected than unexpected tests rather than to qualitatively different test-expectancy-induced encoding strategies.     

The what,how much,and when of study strategies: comparing intended versus actual study behaviour

The study behaviours of students can be assessed from several perspectives, such as what study strategies are used, the total number of hours of study, and the distribution of studying over time. Here, we present the results of a survey study that considered each of these perspectives by asking students to report the what, how much, and when of their study behaviours over the course of a semester. As important, to better understand students’ use of study strategies, we also had students report at the beginning of the semester how they intended to study and their beliefs about the effectiveness of a variety of common strategies. Our results indicate that during the semester, students rely on relatively ineffective strategies and mass their studying the day or two before an exam. However, students intended to begin studying earlier and to use a mix of effective and ineffective study habits. Despite their use of some ineffective strategies, they did have a relatively accurate assessment of which strategies were less versus more effective. Taken together, our results suggest that students have some excellent intentions but may falter because massing study the evening before an exam limits their use of more effective study strategies.     

Is weight-related bullying addressed in school-based anti-bullying programs?

IntroductionThe high prevalence and numerous negative correlates of weight-related bullying among youth emphasize the need to prevent and counter this phenomenon in school settings. This scoping review aims at: (a) determining whether the anti-bullying programs identified in previous systematic reviews and meta-analyses take weight-related bullying into account, and (b) pinpointing effective intervention strategies against weight-related bullying.Literature findingsNone of the 10 systematic reviews and meta-analyses retained addressed weight-related bullying directly. However, their findings highlighted some intervention strategies that may help prevent and reduce this type of bullying.Discussion and conclusionThe results underscore the need to consider weight-related bullying more closely in anti-bullying programs implemented in elementary, middle, and high schools. It is also important to target the intervention strategies most likely to lead to the prevention and reduction of weight-related bullying. Such strategies could include, for example: (a) education, training, and awareness-raising, for school personnel, concerning weight bias, norms and prejudices; and (b) social and emotional support for students who are victims of weight-related teasing or bullying.     

Parental strategies and trajectories of peer victimization in 4 to 5 year olds

This study was designed to examine how parental strategies contribute to explaining trajectories of peer victimization in young children. A total of 73 4 and 5 year old children identified as victims of peer aggression in the fall semester and their parents were recruited from 46 classrooms in 18 schools in the Netherlands. All children were followed-up twice in order to determine for whom victimization was stable. Hypothetical vignettes describing various forms of victimization were presented to one parent of each child in order to assess parental responses to victimization events. Findings indicated that autonomy supporting and autonomy neutral strategies were associated with a decrease of victimization in the first semester of the school year. No protective effects were found in the second semester. Autonomy undermining strategies were not related to the course of peer victimization. These findings underscore the importance of joint and coordinated efforts of teachers and parents as partners in supporting victimized young children at school.     

Attachment patterns and emotion regulation strategies in the second year

With the aim of studying the relationship between methods of emotion regulation and quality of attachment we examined 39 infants with different patterns of attachment, of whom 20 were classified as secure (B), 12 as avoidant (A) and 7 as resistant (C), assessing the regulatory strategies adopted by them during the Strange Situation at 13 months. Secure infants used strategies of positive social engagement more than insecure avoidant infants, while resistant infants displayed greater negative social engagement and less object orientation than the other two groups. Avoidant infants adopted positive and negative hetero-regulatory strategies less than the other groups, also differing from resistant infants in their greater use of object regulatory strategies. There were no significant differences as regards self-comforting regulation. Thus, the findings showed how the most significant differences to emerge between the groups concerned hetero-regulatory strategies, developed by the infant in interaction with attachment figures, and regulatory strategies oriented towards objects. Further analysis showed how the use by part of each attachment group of the emotion regulation strategies varies, differentiating the episodes of the SSP according to their level of stress.     

Benchmark‐based strategies in whole number line estimation

In this study, we used verbal protocols to identify whether adults spontaneously apply quartile‐based strategies or whether they need additional external support to use these strategies when solving a 0–1,000 number line estimation (NLE) task. Participants were assigned to one of three conditions based on the number of external benchmarks provided on the number line. In the bounded condition only the origin and endpoint were indicated, the mid‐point condition included an additional external benchmark at 50%, and in the quartile condition three additional external benchmarks at 25%, 50%, and 75% were specified. Firstly, participants in the bounded condition reported to spontaneously apply quartile‐based strategies to calibrate their estimates. Moreover, participants frequently relied on the external benchmarks for creating internal benchmarks at the mid‐point, quartiles, and even octiles of the number line. Secondly, overall estimation accuracy improved as the number of external benchmarks increased, and target numbers close to external benchmarks were estimated more accurately and with less variability. Thirdly, the use of a larger variety in benchmark‐based strategies was positively related to NLE accuracy. In summary, this study provides evidence that the NLE task induces more sophisticated strategy use in participants than initially anticipated.     

情绪劳动策略对主动破坏行为的影响

如何开展员工情绪劳动管理,避免负面行为结果,是服务行业面对的重要问题。以788名呼叫中心员工为研究对象,本文获得的结果表明:1)表层动作显著促进主动破坏行为,而深层动作的影响不显著。2)政策强度感知显著调节表层动作与主动破坏行为间关系;当政策强度感知较低时,表层动作对主动破坏行为的正向影响更为显著。3)情感社会分享显著调节深层动作与主动破坏行为间关系;当情感社会分享水平较高时,深层动作对主动破坏行为的负向影响更为显著。本研究从资源保存视角提出工作场所开展情绪劳动管理的有效策略。     

小学3～6年级儿童数运算策略的获得及策略应用无效性

研究采用实验室实验和心理测验的方法,选取小学3～6年级的120名儿童为被试,探讨了数运算过程中策略应用无效性是否存在以及儿童策略获得与发展的基本过程。结果发现:(1)在数运算的解题过程中存在策略应用无效性这一阶段;(2)儿童的认知成绩在策略学习前后基本上呈现为一种先下降后上升然后再下降的曲折模式,而不是简单的线性增长;(3)策略获得的过程包括策略探索、策略领会的初步运用和策略使用的退化三个阶段。