نتایج جستجو برای: least absolutes deviations
تعداد نتایج: 418980 فیلتر نتایج به سال:
Genetic assimilation is a possible neo-Darwininan mechanism for the emer-gence and subsequent refinement of the putative innate human language acqui-sition device (LAD). The LAD, in the weak sense of language-specific inductivebias, is a part of all extant models of grammatical acquisition. A survey of argu-ments and counterarguments for the assimilation of such bias during ...
Abstract The present work deals with the study of first three harmonics of low amplitude anisotropic wave trains of cosmic ray intensity over the period 1991-1994 for Deep River neutron monitoring station. It is observed that the diurnal time of maximum remains in the co-rotational direction; whereas, the time of maximum for both diurnal and semi-diurnal anisotropy has significantly shifted tow...
We investigate a model in which we connect slowly time varying unconditional long-run volatility with short-run conditional volatility whose representation is given as a semi-strong GARCH (1,1) process with heavy tailed errors. We focus on robust estimation of both long-run and short-run volatilities. Our estimation is semiparametric since the long-run volatility is totally unspecified whereas ...
The Learning Analytics Dashboard (LAD) is an application to show students’ online behavior patterns in a virtual learning environment. This supporting tool works by tracking students’ log-files, mining massive amounts of data to find meaning, and visualizing the results so they can be comprehended at a glance. This paper reviews previously developed applications to analyze their features. Based...
The convergences of three L1 spline methods for scattered data interpolation and fitting using bivariate spline spaces are studied in this paper. That is, L1 interpolatory splines, splines of least absolute deviation, andL1 smoothing splines are shown to converge to the given data function under some conditions and hence, the surfaces from these three methods will resemble the given data values...
We consider the problem of searching for a best LAD-solution of an overdetermined system of linear equations Xa = z, X ∈ Rm×n, m ≥ n, a ∈ R, z ∈ R. This problem is equivalent to the problem of determining a best LAD-hyperplane x → ax, x ∈ R on the basis of given data (xi, zi), xi = (x (i) 1 , . . . , x (i) n ) ∈ R, zi ∈ R, i = 1, . . . ,m, whereby the minimizing functional is of the form F (a) ...
The leaf area density (LAD) within a tree canopy is very important for the understanding and modeling of photosynthetic studies of the tree. Terrestrial light detection and ranging (LiDAR) has been applied to obtain the three-dimensional structural properties of vegetation and estimate the LAD. However, there is concern about the efficiency of available approaches. Thus, the objective of this s...
The main objective of this paper is to analyze if the classification of countries provided by World Bank (WB) can be reconstructed with a linear and/or integer programming model called Multi-Group Hierarchical Discrimination if only data published by WB are used. WB has a public database of countries containing economical-financial and political factors. The parameters of the model have been de...
Empirical relationships between field-derived Leaf Area Index (LAI) and Leaf Angle Distribution (LAD) and polarimetric synthetic aperture radar (PolSAR) based biophysical indicators were created and applied to map S. alterniflora marsh canopy structure. PolSAR and field data were collected near concurrently in the summers of 2010, 2011, and 2012 in coastal marshes, and PolSAR data alone were ac...
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