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91.
An Extension of Multiple Correspondence Analysis for Identifying Heterogeneous Subgroups of Respondents 总被引:1,自引:0,他引:1
An extension of multiple correspondence analysis is proposed that takes into account cluster-level heterogeneity in respondents’
preferences/choices. The method involves combining multiple correspondence analysis and k-means in a unified framework. The former is used for uncovering a low-dimensional space of multivariate categorical variables
while the latter is used for identifying relatively homogeneous clusters of respondents. The proposed method offers an integrated
graphical display that provides information on cluster-based structures inherent in multivariate categorical data as well
as the interdependencies among the data. An empirical application is presented which demonstrates the usefulness of the proposed
method and how it compares to several extant approaches.
The work reported in this paper was supported by Grant 290439 and Grant A6394 from the Natural Sciences and Engineering Research
Council of Canada to the first and third authors, respectively. We wish to thank Ulf B?ckenholt, Paul Green, and Marc Tomiuk
for their insightful comments on an earlier version of this paper. We also wish to thank Byunghwa Yang for generously providing
us with his data. 相似文献
92.
93.
K Nakamura 《Journal of experimental psychology. Animal behavior processes》2001,27(4):345-353
To examine the nature of age-dependent cognitive decline, performance in terms of concurrent object discriminations was assessed in aged and nonaged Japanese monkeys (Macaca fuscata). Aged monkeys required more sessions and committed more errors than nonaged ones in the discriminations, even in simple object discriminations. Analyses of errors suggest that aged monkeys repeated the same errors and committed more errors when they chose a negative object at the 1st trial. A hypothesis analysis of behavior suggests that their incorrect choices were mainly due to object preference. Therefore, the impairment was probably caused by a failure to inhibit inappropriate responses. Together with previous neuropsychological findings, deficits of aged monkeys in the performance of object discriminations can be explained by dysfunction of the frontal cortex. 相似文献
94.
Lim A Nakamura BJ Higa-McMillan CK Shimabukuro S Slavin L 《Behaviour research and therapy》2012,50(6):397-406
Enhancing the public health impact of evidence-based practices (EBPs) in usual care settings is a key priority of the National Institute of Mental Health. Longitudinal data from community mental health providers (N = 268) participating in a series of state-sponsored workshops in modular approaches to EBPs for youth are presented. EBP workshop attendance for youth anxiety resulted in increased knowledge for EBPs for anxiety (and not other conditions) and EBP workshop attendance for youth disruptive behaviors resulted in increased knowledge for EBPs for disruptive behaviors (and not other conditions). Providers' tendencies toward incorrectly classifying non-EBP therapies as evidence-based increased over time, suggesting that providers over-generalize the EBP label as a result of attending these types of workshops. Regarding EBP attitudes, most measures of attitudes improved when providers attended a workshop. Additionally, an overly inclusive view of what constitutes an EBP at intake was related to significant decreases in openness to trying EBPs over time, whereas more positive attitudes at intake was related to achieving a more refined view of what constitutes an EBP over the course of attending trainings. Study limitations and implications for implementation of EBPs in usual care settings are discussed. 相似文献
95.
Numerous studies have reported an effect of prosodic information on parsing but whether prosody can impact even the initial parsing decision is still not evident. In a visual world eye-tracking experiment, we investigated the influence of contrastive intonation and visual context on processing temporarily ambiguous relative clause sentences in Japanese. Our results showed that listeners used the prosodic cue to make a structural prediction before hearing disambiguating information. Importantly, the effect was limited to cases where the visual scene provided an appropriate context for the prosodic cue, thus eliminating the explanation that listeners have simply associated marked prosodic information with a less frequent structure. Furthermore, the influence of the prosodic information was also evident following disambiguating information, in a way that reflected the initial analysis. The current study demonstrates that prosody, when provided with an appropriate context, influences the initial syntactic analysis and also the subsequent cost at disambiguating information. The results also provide first evidence for pre-head structural prediction driven by prosodic and contextual information with a head-final construction. 相似文献
96.
Over the last 50 years, theoretical, speculative, and empirical scholarship has examined the influence of early family context on subsequent accomplishments in children of high ability. Building upon 40 years of creativity literature focusing on optimal experience, this exploratory study applied the Complex Family Framework in a systematic analysis of creative adults' recollections of their early family lives. The study identifies evidence of the interplay of Integration and Differentiation, a catalyst for individual optimal experience, in the families of 9 creative exemplars who have made significant contributions to contemporary culture. Five participants represented the Arts and Humanities, three the Social Sciences, and one the Physical Sciences. The study demonstrates the utility of the Complex Family Framework in understanding families' contributions to children's later creative achievement. 相似文献
97.
Takahito Nakamura Takahiro Higuchi Toyo Kikumoto Takanori Takeda Hideyuki Tashiro Fumihiko Hoshi 《Journal of motor behavior》2013,45(6):640-646
We examined the behavioral characteristics of reactive turning in hemiplegic stroke patients when they were informed of the turning direction just before turning was required at an unpredictable time. Eleven stroke patients and 20 healthy elderly control people were asked to initiate a turn as soon as a visual cue to inform them of the turning direction was activated unpredictably using a foot switch. Both the segmental reorientation and stepping type when turning 90° while walking were measured. The results indicated preserved segmental reorientation of the head and pelvis in stroke patients. Stroke patients showed delays in pelvic turning but not in head turning. Their delayed pelvic movement might be due to motor dysfunction and the time taken to ensure stability when deciding when to turn. 相似文献
98.
The growth curve model has been a useful tool for the analysis of repeated measures data. However, it is designed for an aggregate-sample analysis based on the assumption that the entire sample of respondents are from a single homogenous population. Thus, this method may not be suitable when heterogeneous subgroups exist in the population with qualitatively distinct patterns of trajectories. In this paper, the growth curve model is generalized to a fuzzy clustering framework, which explicitly accounts for such group-level heterogeneity in trajectories of change over time. Moreover, the proposed method estimates parameters based on generalized estimating equations thereby relaxing the assumption of correct specification of the population covariance structure among repeated responses. The performance of the proposed method in recovering parameters and the number of clusters is investigated based on two Monte Carlo analyses involving synthetic data. In addition, the empirical usefulness of the proposed method is illustrated by an application concerning the antisocial behavior of a sample of children. 相似文献
99.
Kubo N Kato A Nakamura K 《Journal of comparative psychology (Washington, D.C. : 1983)》2006,120(4):449-455
To investigate the ability of aged monkeys to plan and the effect of aging on this ability, performance in a food retrieval task was assessed in aged and younger Japanese monkeys (Macaca fuscata). In this task, the monkeys had to retrieve food items by selecting from a set of 9 holes, each of which contained 1 food item. Results showed that task performance declined significantly with age. All monkeys showed, to a greater or lesser extent, some consistent patterns in their sequence of selecting holes for retrieving the food item. An analysis of these selection patterns indicated that the younger monkeys showed more consistent sequences in selection than the aged monkeys. Furthermore, success in the task performance correlated strongly with higher consistency in the sequence of selecting holes. The authors simulated performance for this task by monkeys without any strategies or plans. The results suggest that the empirical data were far more systematic than the simulated data. Thus, the authors conclude that Japanese monkeys have the ability to plan and that this ability to plan deteriorates with age. 相似文献
100.
Two experiments were conducted to investigate the reaction times (RTs) and anticipation of karate athletes. In Experiment 1, choice RTs and simple RTs were measured with two types of stimuli. One was videotaped scenes of opponent's offensive actions, which simulated the athletes' view in real situations, and the other was static filled circles, or dots. In the choice RT task, participants were required to indicate as soon as possible whether the offensive actions would be aimed at the upper or middle level of their body, or the dot was presented either at a higher or a lower position. In the simple RT task, they were required to respond as soon as possible when the offensive action started from a static display of the opponent's ready stance, or a dot appeared on the display. The results showed significant differences between the karate athletes and the novices in the choice RT task, the difference being more marked for the video stimuli than for the dot stimuli. There was no significant difference in simple RT between the two groups of participants, for either type of stimuli. In Experiment 2, the proportions of correct responses (PCRs) were measured for video stimuli which were cut off at the seventh frame from the onset of the opponent's offensive action. The athletes yielded significantly higher PCRs than the novices. Collectively the results of the two experiments demonstrate the superior anticipatory skills of karate athletes regarding the target area of an opponent's attack (Scott, Williams, & Davids, Studies in perception and action II: Posters presented at the VIIth International conference on Event Perception and Action, Erlbaum, Hillsdale, NJ, 1993, p. 217; Wiiliams & Elliot, Journal of Sport & Exercise Psychology 21 (1999) 362), together with their advantage over novices in non-specific sensory functions (e.g., vertical discrimination). 相似文献