Results 61 to 70 of about 24,420 (193)
The ecology of attraction: Fruit traits and frugivore diversity in neotropical Piper
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Fruit traits can benefit plant reproduction by enhancing seed dispersal by mutualistic frugivores (e.g. seed dispersal syndromes), but identifying the role of specific fruit traits in mediating frugivory is challenging because these traits can serve multiple functions ...
Sharlene E. Santana +3 more
wiley +1 more source
The phylogenetic effective sample size and jumps
, 2018 The phylogenetic effective sample size is a parameter that has as its goal the quantification of the amount of independent signal in a phylogenetically correlated sample. It was studied for Brownian motion and Ornstein-Uhlenbeck models of trait evolution.
Bartoszek, Krzysztof
core +1 more source
The persistent advantage of model‐based phylogenetic methods for single‐trait prediction
Methods in Ecology and Evolution, EarlyView.Abstract Reliable predictions of biological traits support a wide range of applications, from bioprospecting to informing conservation priorities. Given the complexity and diversity of trait evolution, robust methods for trait prediction are essential for drawing meaningful evolutionary inferences from phylogenetic data.
Adam Richard‐Bollans +1 more
wiley +1 more source
Stats, 2021 We consider a spread financial market defined by the multidimensional Ornstein–Uhlenbeck (OU) process. We study the optimal consumption/investment problem for logarithmic utility functions using a stochastic dynamical programming method.
Sahar Albosaily +1 more
doaj +1 more source
Detecting Critical Change in Dynamics Through Outlier Detection with Time‐Varying Parameters
British Journal of Mathematical and Statistical Psychology, EarlyView.Abstract Intensive longitudinal data are often found to be non‐stationary, namely, showing changes in statistical properties, such as means and variance‐covariance structures, over time. One way to accommodate non‐stationarity is to specify key parameters that show over‐time changes as time‐varying parameters (TVPs). However, the nature and dynamics of
Meng Chen +2 more
wiley +1 more source
British Journal of Mathematical and Statistical Psychology, EarlyView.Abstract In the present study, we extend a stochastic differential equation (SDE) model, the Ornstein–Uhlenbeck (OU) process, to the simultaneous analysis of time series of multiple variables by means of random effects for individuals and variables using a Bayesian framework.
José Ángel Martínez‐Huertas +1 more
wiley +1 more source
Epidemic Waves in a Stochastic SIRVI Epidemic Model Incorporating the Ornstein–Uhlenbeck Process
Mathematics, 2023 The worldwide data for COVID-19 for active, infected individuals in multiple waves show that traditional epidemic models with constant parameters are not able to capture this kind of disease behavior.
Fehaid Salem Alshammari +1 more
doaj +1 more source
On weak uniqueness for some degenerate SDEs by global $L^p$ estimates
, 2014 We prove uniqueness in law for possibly degenerate SDEs having a linear part in the drift term. Diffusion coefficients corresponding to non-degenerate directions of the noise are assumed to be continuous.
Priola, Enrico
core +1 more source
Life Cycle Consumption and Portfolio Choice Under Real Interest Rate Risk
Financial Management, EarlyView.ABSTRACT We set up a life cycle model with real interest rate risk to demonstrate that real interest rates have implications for optimal household consumption and investments. Lower interest rates lead to higher optimal stock investments and lower consumption.
Marcel Fischer, Natascha Jankowski
wiley +1 more source
AIMS MathematicsIn this paper, we investigated a food chain model driven by the Ornstein-Uhlenbeck process, incorporating the Holling type Ⅱ functional response, nonlinear prey refuge, and the Allee effect in the top predator.
Shujie Yang, Binghui Zhao, Xiaohui Ai
doaj +1 more source