We propose a sampling-based Bayesian t test that allows researchers to quantify the statistical evidence in favor of the null
hypothesis. This Savage—Dickey (SD) t test is inspired by the Jeffreys—Zellner—Siow (JZS) t test recently proposed by Rouder,
Speckman, Sun, Morey, and Iverson (2009). The SD test retains the key concepts of the JZS test but is applicable to a wider
range of statistical problems. The SD test allows researchers to test order restrictions and applies to two-sample situations
in which the different groups do not share the same variance. 相似文献
Attention, Perception, & Psychophysics - Stimulus discriminability is often assessed by comparisons of two successive stimuli: a fixed standard (St) and a varied comparison stimulus (Co).... 相似文献
The aim of the present study was to analyse family dinners as context of argumentation and argumentative development by using a context-sensitive model of basic argumentative structures in every day conversations. The data consisted of 40 argumentative sequences in dinner conversations in twenty Swedish families with children aged 7 to 17 years. The families were divided in two groups depending on the children's ages (10–11 years with younger siblings and 10–12 years with older siblings). The model revealed characteristic structures of argumentation appearing as co-text and suggested differences between family groups depending on contextual factors such as age of the children. The groups of older children produced longer argumentative sequences, more exchanges per sequence and higher rate of turns. The older children also engaged in non-instrumental deliberations and disputations significantly more often and they performed more elaborated expansions (through a higher quantity of backing arguments). The groups of younger children on the other hand were more often involved in negotiations on topics relevant in the immediate context. Less expected was, however, the lack of more complex and varied arguments, even in the groups of older children. 相似文献
Wechsler Adult Intelligence Scale (WAIS) subscale Similarities have been classified as a test of either verbal comprehension or of inductive reasoning. The reason may be that items divide into two categories. We tested the hypothesis of heterogeneity of items in WAIS-Similarities. Consecutive patients at a memory clinic and healthy controls participated in the study. White-matter hyperintensities (WMHs) and normalized temporal lobe volumes were measured based on Magnetic resonance Imaging (MRI), and tests of verbal memory and attention were used in addition to WAIS-Similarities to collect behavioural data. Factor analysis supported the hypothesis that two factors are involved in the performance of WAIS-similarities: (1) semiautomatic lexical access and (2) conceptual elaboration. These factors were highly correlated but provided discriminative diagnostic information: In logistic regression analyses, scores of the lexical access factor and of the conceptual elaboration factor discriminated patients with mild cognitive impairment from Alzheimer’s disease patients and from healthy controls, respectively. High scores of WMH, indicating periventricular white-matter lesions, predicted factor scores of direct lexical access but not those of conceptual elaboration, which were predicted only by medial and lateral temporal lobe volumes. 相似文献
Attention, Perception, & Psychophysics - Due to a printing error, the factor “2” was missing in the last line of Equation 9. It has now been reinstated. The original article has... 相似文献
The present study focuses on the following questions: (a) Are students with learning disabilities (LD) and low-achieving students (LA), when controlling for age and gender, less accepted by peers, do they feel more lonely, do they have lower self-esteem, and do they feel more depressed than NLD and NLA students? (b) Does low achievement per se or does selection into special education programs or special class placement of students with LD affect these students' psychological adjustment? Two analyses were conducted to elucidate these questions. Concerning the first question, the analysis was based on a sample of 1,434 4th-, 7th-, and 9th-grade students drawn from regular school classes. It revealed that students with LD compared with NLD and NLA students were less accepted by peers, had lower self-esteem, and felt more lonely. LA students compared with NLD and NLA students were less accepted by peers, had lower self-esteem, and were more depressed. Concerning the second question, the analysis was based on a subsample of 276 LD and LA students. It revealed that, when controlling for age and gender, and holding achievement in reading, writing, arithmetic, and intelligence constant, LD students compared with LA students were less depressed but were less accepted by peers and felt lonelier. Thus, besides the effects of low academic achievement, to be labeled “a student with LD” may have negative effects primarily on peer acceptance and directly and indirectly on feelings of loneliness, particularly in primary school.