NBC News Scripts
WBAP-TV (Television station : Fort Worth, Tex.)
1954-12-31
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You search for ability and 171,111 records were found.
We investigated the swimming abilities of three Costa Rican dry forest rodents (Coues' rice rat. Oryzomys couesi, hispid cotton rat, Sigmodon hispidus, and spiny pocket mouse, Liomys salvini) associated with a large marsh, Laguna Palo Verde, using 90 s swim trials in a plastic container. Swimming ability was evaluated by observing the use of limbs and tail in the water, inclination to the surface, and diving and floating behavior. Rice rats could float, swim and dive, suggesting that they can exploit surface and underwater resources. Cotton rats swam at the water's surface, but were less skilled swimmers than rice rats. Spiny pocket mice tired quickly and had difficulty staying at the water's surface. Results suggest that differential swimming ability is related to the distribution of the three sympatric species within the marsh and ad...
In this paper, we formulate the optimal channel access of secondary user system in cognitive radio networks as the total reward maximization by Partially Observable Markov Decision Processes (POMDPs). Match Ability is proposed that takes allowable channel transmission rate and bit-error-rate (BER) required by receiving end into account. A heuristic greedy algorithm for channel access is proposed that is based on the local maximum match ability. By combining the utility function of queuing delay with local match ability, we improve the global average delay fairness. It is demonstrated by simulation results that as the average arrival rate increases, the large stable region of low delay can be maintained by adjusting utility function of the average waiting time under the condition that all the control information time overhead is not con...
NAture, nurture and political orientations
OBJECTIVES: To assess relationships between vision (contrast sensitivity, stereopsis, visual acuity) and a performance-based measure of ability to implement new medications.DESIGN: Cross-sectional analysis; prospective cohort study.SETTING: Community-based.PARTICIPANTS: Three hundred thirty-five participants aged 73 to 82 in Year 3 of the Women's Health and Aging Study 11, a representative sample of the two-thirds least-disabled community-dwelling women.MEASUREMENTS: Hopkins Medication Schedule Pillbox Ratio, a joint measure of accuracy and time, and a performance-based measure of ability to Implement a prescription. Participants received written and verbal instructions for taking two medications and were directed to place pills in a pillbox accordingly. Vision assessments: contrast sensitivity (Pelli-Robson letter sensitivity chart), ...
A large fraction of the variation in wage levels and wage growth rates among individuals remains unexplained. Economists argue that ?unobserved? heterogeneity is among the more likely reasons for this unexplained variation in wages. The source of individual heterogeneity is typically attributed to data limitations and the unobservability of certain productivity related factors. In this paper we present a theory of career choice and derive a discriminating test between two inherently unobservable sources of heterogeneity – learning ability and workers? inter-temporal preferences (discounting) – both of which can clearly account for the variation in wage levels and wage growth rates. We apply this test to the large observed differences in wages and wage growth rates between smokers and non-smokers. The empirical evidence suggests that sm...
One aspect of an analysis of survival data based on the proportional hazards model that has been receiving increasing attention is that of the predictive ability or explained variation of the model. A number of contending measures have been suggested, including one measure, R 2 (í µí»½), which has been proposed given its several desirable properties, including its capacity to accommodate time-dependent covariates, a major feature of the model and one that gives rise to great generality. A thorough study of the properties of available measures, including the aforementioned measure, has been carried out recently. In that work, the authors used bootstrap techniques, particularly complex in the setting of censored data, in order to obtain estimates of precision. The motivation of this work is to provide analytical expressions of precision,...
The aim of this study is to broaden our understanding of the construction and early decline of spatial mental representations in route learning, considering the extent to which spatial ability and age-related differences in environment learning interact. The experiment examines spatial mental representation derived from taking a realistic route acquired using virtual environment and compares individuals different in age but with similar spatial ability. A sample of 34 young (20-30 years) and 30 middle-aged (50-60 years) females with good mental rotation ability were chosen. Participants learned a complex route through its presentation in a virtual environment and then performed a series of tasks (landmark recognition, location of landmarks and verification of spatial relations). Results show that the two participant age groups had simi...
[Abstract]: The concept of a timesharing ability has been the subject of considerable interest in recent times. The present study set out to determine whether a timesharing factor can be identi¬fied when a number of competing tasks are presented in the midst of a range of single tests designed to sample a broad range of psychological dimensions. Evidence for the existence of such a factor would form an important addition to our knowledge of human cognitive functioning.
The framework for the study was provided by the theory of fluid and crystallized intelligence. A battery of single and competing tasks was presented to 126 subjects. The competing tasks represented a variety of within- and across-factor combinations from different levels of the (Gf/Gc) hierarchy. Modality of presentation was also varied in some combinations. On the basis...
The purpose of this study was to determine the relationship between articulation ability and reading ability, between articulation ability and language development, and between language development and reading ability. This study examined children with minor difficulties and children with a history of more severe articulation problems separately in order to determine whether severity of articulation disability is related to reading ability.
