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Direct linkHopper, Lydia M.; Flynn, Emma G.; Wood, Lara A. N.; Whiten, Andrew – Journal of Experimental Child Psychology, 2010
In the first of two experiments, we demonstrate the spread of a novel form of tool use across 20 "cultural generations" of child-to-child transmission. An experimentally seeded technique spread with 100% fidelity along twice as many "generations" as has been investigated in recent exploratory "diffusion" experiments of this type. This contrasted…
Descriptors: Socialization, Population Distribution, Imitation, Observational Learning
Woods, Carol M.; Thissen, David – Psychometrika, 2006
The purpose of this paper is to introduce a new method for fitting item response theory models with the latent population distribution estimated from the data using splines. A spline-based density estimation system provides a flexible alternative to existing procedures that use a normal distribution, or a different functional form, for the…
Descriptors: Simulation, Population Distribution, Item Response Theory, Computation
