Worker traits and worker functions in DOT

Some users of the worker traits ratings and worker function hierarchies in DOT do not seem to be fully aware that the two systems are in large part redundant: the worker traits can be efficiently summarized by the ratings of worker functions (level of complexity of working with data, people and things). This paper, a by-product of an extension of DOT to the Australian Census Classification of Occupations, attempts to validate the worker function hierarchies in terms of the worker traits required by different jobs in DOT. It shows empirically that the variation in worker traits across the 21,741 occupations listed in DOT is closely reflected in the 197 worker function profiles, which have the better research potential.     

Developmental aspects of the generation effect

Children from Grades 2, 3, 5, and 7 (7.6, 9, 11, and 13 years of age, respectively) were required to generate or study exemplars of semantic categories (semantic orientation) or rhymes to stimulus words (phonetic orientation). Each child then participated in one of three retention tests: free recall, standard recognition, and rhyme recognition. The results indicated that the developmental emergence of the “generation effect” (C. E. McFarland, Jr., T. J. Frey, & D. D. Rhodes, Journal of Verbal Learning and Verbal Behavior, 1980, 19, 210–225; N. J. Slamecka & P. Graf, Journal of Experimental Psychology: Human Learning and Memory, 1978, 4, 592–604) was dependent on both encoding orientation and the type of retention task employed. A substantial generation effect first emerged (7-year-olds) for standard recognition in the semantic condition. A similar effect for recall was evident for 9-year olds, but not for younger children. Internal stimulus generation became a strong memory facilitator for phonetically encoded items at age 11 for standard recognition, but not until age 13 for recall. The results of the rhyme recognition test indicated that internal generation facilitated “transfer-appropriate processing” (C. D. Morris, J. D. Bransford, & J. J. Franks, Journal of Verbal Learning and Verbal Behavior, 1977, 16, 519–533) only for seventh graders (age 13). The processes underlying this developmental pattern were discussed.     

Detecting group differences in sequential association using sampled permutations: Log odds,kappa, and phi compared

When determining whether a particular transition is more characteristic of one group than of another, two things are required: an index associated with the transition of interest and a statistical test that can determine whether group membership systematically affects values for that index. Here the familiar parametrict test is compared with a test based on sampled permutations. Indices considered are the odds and log odds ratio, Yule’sQ, Wampold’s (1989) transformed kappa, and phi. The odds and log odds ratio are monotonically increasing functions of Yule’sQ and so give similar results. Yule’sQ and phi are essentially rank order invariant and usually give similar results. Transformed kappa, however, rank orders subjects somewhat differently than the others; moreover, it appears somewhat biased. With respect to the tests, when subjects are 20 or more it does not matter much whether sampled permutation or parametrict tests are used; both yield essentially the same result. However, when subjects are fewer than 20, or whenever there is any other reason to think that parametric assumptions may not be met, permutation tests are recommended. A computer program that effects such tests is described.     

Multilevel covariance structure analysis of sibling substance use and intrafamily conflict

Conventional covariance structure analysis, such as factor analysis, is often applied to data that are obtained in a hierarchical fashion, such as siblings observed within families. A more appropriate specification is demonstrated which explicitly models the within-level and between-level covariance matrices of sibling substance use and intrafamily conflict. Participants were 267 target adolescents (mean age=13.11 years) and 318 siblings (mean age=15.03 years). The level of homogeneity within sibling clusters, and heterogeneity among families, was sufficient to conduct a multilevel covariance structure analysis (MCA). Parental and family-level variables consisting of marital status, socioeconomic status, marital discord, parent use, and modeling of substances were used to explain heterogeneity among families. Marital discord predicted intrafamily conflict, and parent marital status and modeling of substances predicted sibling substance use. Advantages and uses of hierarchical designs and conventional covariance structure software for multilevel data are discussed.     

The time course of mood-induced decrements in colour-naming of threat-related words

The current study investigated the relationship between processing biases towards affectively negative words and a film-based mood manipulation procedure. Subjects either watched a film about nuclear war or sat alone for ten minutes and then colournamed sets of negative, positive and neutral words. Testing occurred after one of three possible time intervals. Impaired colour-naming of negative words was found both immediately and five minutes after watching the film. There was no consistent pattern of colour-naming impairments for the positive words. It was found that, when baseline Stroop performance was taken into account, and the semantic priming effect caused by stimulus homogeneity was controlled for, the resulting impairment in the colournaming of negative words was accounted for by state anxiety levels alone, and not the previously found interaction of state and trait anxiety.