188,174 research outputs found
Superstars without talent? The Yule distribution controversy
No full textChung and Cox (1994) provided an intuitively appealing stochastic model which indicates that superstars may exist regardless of talent and which gives rise to the Yule distribution. We adopt a different empirical approach and test its goodness-of-fit using a parametric bootstrap and several powerful test statistics. Just like the discrete Pareto distribution, it is overwhelmingly rejected: it is a fairly accurate approximation of the lower quantiles of the superstar distribution, but overestimates the snowball effect that makes consumers purchase records of the most successful artists. In other words, the Yule distribution captures stardom, but not superstardom. A generalization of the Yule distribution provides an excellent fit in two of the three data sets.Superstardom; Yule distribution
P. Yule (éd.), Late antique Arabia (2013)
No full textSchiettecatte Jérémie. P. Yule (éd.), Late antique Arabia (2013). In: Topoi, volume 18/2, 2013. pp. 681-686
The simulation of action disorganisation in complex activities of daily living
No full textAction selection in everyday goal-directed tasks of moderate complexity is known to be subject to breakdown following extensive frontal brain injury. A model of action selection in such tasks is presented and used to explore three hypotheses concerning the origins of action disorganisation: that it is a consequence of reduced top-down excitation within a hierarchical action schema network coupled with increased bottom-up triggering of schemas from environmental sources, that it is a more general disturbance of schema activation modelled by excessive noise in the schema network, and that it results from a general disturbance of the triggering of schemas by object representations. Results suggest that the action disorganisation syndrome is best accounted for by a general disturbance to schema activation, while altering the balance between top-down and bottom-up activation provides an account of a related disorder - utilisation behaviour. It is further suggested that ideational apraxia (which may result from lesions to left temporoparietal areas and which has similar behavioural consequences to action disorganisation syndrome on tasks of moderate complexity) is a consequence of a generalised disturbance of the triggering of schemas by object representations. Several predictions regarding differences between action disorganisation syndrome and ideational apraxia that follow from this interpretation are detailed
Oxyethira paludicola WELLS & YULE 2007
No full textOxyethira paludicola WELLS & YULE 2007 Diese soeben (WELLS &YULE) aus Malaysia (Selangor) beschriebene Art haben wir von Sumatra, Aceh, Kruet Selatan NP, 13 km N von Bakongan, 2°59‘N, 97°23‘E, 0m, 6.4.199 7, leg. Malicky: 30, 126. Ein auffallendes Merkmal dieser Art ist die lange, dichte Behaarung der Hinterbeine der Männchen. Eine solche gibt es auch bei O. acuta KOBAYASHI 1977 aus Hokkaido, aber nach den Zeichnungen der KA ist O. acuta nicht identifizierbar.Published as part of Malicky, H. & Chantaramongkol, P., 2007, Beiträge zur Kenntnis asiatischer Hydroptilidae (Trichoptera), pp. 1009-1099 in Linzer biologische Beiträge 39 (2) on page 102
Yule [Une biographie de]
No full textJohnson, Norman L. and Kotz, Samuel. Leading personalities in statistical sciences from the seventeenth century to the present. Hoboken : Wiley, 2007, 432 p. ISBN : 978-0-4711-6381-7National audienceTraduction libre de la notice biographique “ Yule, George Udny ” in Leading personalities in statistical sciences from the seventeenth century to the present, N.L. Johnson & S. Kotz , pp. 168-169
A Yule-Simon process with long-term memory
No full textThe Yule-Simon model has been used as a tool to describe the growth of
diverse systems, acquiring a paradigmatic character in many fields of research.
Here we study a modified Yule-Simon model that takes into account the
full history of the system by means of a hyperbolic memory kernel.
We show how the memory kernel changes the properties of preferential attachment
and provide an approximate analytical solution for the frequency
distribution density as well as for the frequency-rank distribution
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Accompanying the Governor's message ::To the Honorable Robert P. Dunlap, Governor of the State of Maine.
No full textReport to Robert P. Dunlap, Governor of Maine, regarding a trip to Quebec to negotiate a survey and possible aid for a railroad from Quebec to the Atlantic seaboard through the state of Maine. This trip was favorable for such a connection; of note, the two representatives did not suggest a final terminal on the seaboard, but left it to the state to determine. The report is signed by Albert Smith and P.H. Green. Included is a report signed by P. Yule, Captain Royal Engineers, 22d August, 1835, and certified by T.A. Young, Secretary to the Committee of Citizens
Statistical regularity of firm size distribution: the Pareto IV and truncated Yule for Italian SCI manufacturing
No full textFirm size distribution, Pareto distributions, Yule distribution, Gibrat’s Law, L11, L60, C16,
Results of the Generalized Mixed Yule Coalescent (GMYC) analyses.
No full text<p>Clusters: OTUs delineated by GMYC with more than one specimen, Entities: singleton OTUs delineated by GMYC, CI: confidence interval, BEAST: Bayesian gene tree reconstructed in BEAST, Yule: Yule tree prior, Coalescent: coalescent tree prior, Single: single threshold model, Multiple: multiple threshold model.</p><p>Results of the Generalized Mixed Yule Coalescent (GMYC) analyses.</p
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