منابع مشابه
Finding community structures in networks by playing pass-the-parcel
Many data sets can be represented by undirected networks. Often, an interesting and important feature of these networks is the existence of communities; groups of nodes whose interconnectivity is higher than the average for the network. Finding these communities can be a difficult problem; exhaustive search and even simulated annealing methods are impractical for larger networks. Here, a differ...
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We examine the controversial practice of using parcels of items as manifest variables in structural equation modeling (SEM) procedures. After detailing arguments pro and con, we conclude that the unconsidered use of parcels is never warranted, while, at the same time, the considered use of parcels cannot be dismissed out of hand. In large part, the decision to parcel or not depends on one’s phi...
متن کاملParcel model simulations of aerosol
Parcel model simulations of aerosol – warm phase cloud microphysics interactions over the Amazon A. A. Costa and S. Sherwood Department of Geology and Geophysics, Yale University, New Haven, CT, USA Fundação Cearense de Meteorologia e Recursos Hı́dricos, Fortaleza, Brazil Received: 19 October 2004 – Accepted: 9 December 2004 – Published: 31 January 2005 Correspondence to: A. A. Costa (alexandre....
متن کاملImplications of Parcel-Allocation Variability for Comparing Fit of Item-Solutions and Parcel-Solutions
This article relates a still-popular motivation for using parceling to an unrecognized cost. The stillpopular motivation is improvement in fit with respect to the item-solution. The cost is uncertainty in fit due to the selection of one out of many possible item-to-parcel allocations. A theoretical framework establishes the reason for this relationship: The same mechanisms that cause larger ite...
متن کاملTime-dependent freezing rate parcel model
The time-dependent freezing rate (TDFR) model here described represents the formation of ice particles by immersion freezing within an air parcel. The air parcel trajectory follows an adiabatic ascent and includes a period in time when the parcel remains stationary at the top of its ascent. The description of the ice nucleating particles (INPs) in the air parcel is taken from laboratory experim...
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ژورنال
عنوان ژورنال: Nature Reviews Immunology
سال: 2007
ISSN: 1474-1733,1474-1741
DOI: 10.1038/nri2160