We consider the estimation of regression coefficients in a high-dimensional linear model. For regression coefficients in lr balls, we provide lower bounds for the minimax lq risk and minimax quantiles of the lq loss for all design matrices. Under an l0 sparsity condition on a target coefficient vector, we sharpen and unify existing oracle inequalities for the Lasso and Dantzig selector. We deri...

The linear-quadratic (LQ) model is widely used to model the effect of total dose and dose per fraction in conventionally fractionated radiotherapy. Much of the data used to generate the model are obtained in vitro at doses well below those used in radiosurgery. Clinically, the LQ model often underestimates tumor control observed at radiosurgical doses. The underlying mechanisms implied by the L...

ABSTRAK
 
 Penelitian ini bertujuan untuk mengetahui dampak dari adanya bulan Ramadhan terhadap perusahaan-perusahaan yang ada di indeks saham LQ-45 Bursa Efek Indonesia (BEI) selama periode 2015-2019. Variabel dalam penelitian adalah abnormal return dan trading volume activity. menggunakan data sekunder yaitu Indeks Harga Saham Gabungan (IHSG) beserta perdagangan aktif, harga harian ...

Perencanaan pengembangan secara efektif dan efisien digunakaan ketika sudah mengetahui potensi masing-masing lokasi. Tujuan dari penelitian ini adalah untuk mengidentifikasi mengkaji sektor basis serta daerah yang berpotensi dikembangkan di kota Binjai Provinsi Sumatera Utara. Informasi data dikumpulkan dokumen didapat lembaga pemerintah, seperti: Badan Pusat Statistika Binjai, provinsi Pada pe...

Recent studies of under-determined linear systems of equations with sparse solutions showed a great practical and theoretical efficiency of a particular technique called l1-optimization. Seminal works [7, 20] rigorously confirmed it for the first time. Namely, [7, 20] showed, in a statistical context, that l1 technique can recover sparse solutions of under-determined systems even when the spars...

Background: impact of dizziness on life quality (LQ). Aim: to adapt the Dizziness Handicap Inventory (DHI) for application in the Brazilian population; to assess its reproducibility; and to describe the results obtained in patients with chronic dizziness. Method: The DHI was initially applied in 45 patients with chronic dizziness and with a clinical diagnosis of vestibular syndrome. The applica...

BACKGROUND Conventional methods to assess local activation time (LAT) detect the peak of the bipolar electrogram (B-LATPeak) or the maximal negative slope of the unipolar electrogram (U-LATSlope). We evaluated 3 novel methods to assess LAT: onset (B-LATOnset) and center of mass (B-LATCoM) of bipolar electrogram, and maximal negative slope of unipolar electrogram within a predefined bipolar wind...

This paper discusses the implementation of an LQ control strategy through the use of a Minimal Control Synthesis adaptive algorithm recently presented in the literature. It is shown that by using such approach the structural stability of the closed-loop system can be improved with respect both parameter mismatches and nonlinear perturbations. A case study discussed in the literature on LQ contr...

In this paper, we consider a stochastic realization problem with finite covariance data based on “LQ decomposition” in a Hilbert space, and re-derive a non-stationary finite-interval realization ([4, 5]). We develop a new algorithm of computing system matrices of the finiteinterval realization by LQ decomposition, followed by the SVD of a certain block matrix. Also, a stochastic subspace identi...