Continuous updating gmm estimator
k-means clustering aims to partition n observations into k clusters in which each observation belongs to the cluster with the nearest mean, serving as a prototype of the cluster.
This results in a partitioning of the data space into Voronoi cells.
This is the well known Arellano-Bond estimator, or first-difference (DIF) GMM estimator (see Arellano and Bond ).
The DIF GMM estimator was found to be inefficient since it does not make use of all available moment conditions (see Ahn and Schmidt ); it also has very poor finite sample properties in dynamic panel data models with highly persistent series and large variations in the fixed effects relative to the idiosyncratic errors (see Blundell and Bond ) since the instruments in those cases become less informative.
In recent decades, dynamic panel data models with unobserved individual-specific heterogeneity have been widely used to investigate the dynamics of economic activities.
Several estimators have been suggested for estimating the model parameters.
Ashley 1, and Xiaojin Sun 2,, 1 Department of Economics, Virginia Tech, Blacksburg, VA 24060; 2 Department of Economics and Finance, University of Texas at El Paso, El Paso, TX 79968; * Correspondence: Tel.: These authors contributed equally to this work.
Academic Editor: name Version May 25, 2016 submitted to Econometrics; Typeset by LATEX using class file Abstract: The two-step GMM estimators of Arellano and Bond 1] and Blundell and Bond 2] for dynamic panel data models have been widely used in empirical work; however, neither of them performs well in small samples with weak instruments.
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The convincing results suggest that the diseconomy of scale is recognized in the occurrence of traffic fatalities.
ABSTRACT: The two-step GMM estimators of Arellano and Bond (1991) and Blundell and Bond (1998) for dynamic panel data models have been widely used in empirical work; however, neither of them performs well in small samples with weak instruments.
The problem is computationally difficult (NP-hard); however, there are efficient heuristic algorithms that are commonly employed and converge quickly to a local optimum.
These are usually similar to the expectation-maximization algorithm for mixtures of Gaussian distributions via an iterative refinement approach employed by both algorithms.You can also change the view style at any point from the main header when using the pages with your mobile device.