When prior estimates of regression coe cients along with their stan dard errors or their variance covariance matrix are available they can be incorporated into the estimation procedure through minimax linear and mixed regression approaches It is demonstrated that the mixed regres sion approach provides more e cient estimators at least asymptotically in comparison to the minimax linear approach ...

This paper studies the feature selection problem using a greedy least squares regression algorithm. We show that under a certain irrepresentable condition on the design matrix (but independent of the sparse target), the greedy algorithm can select features consistently when the sample size approaches in nity. The condition is identical to a corresponding condition for Lasso. Moreover, under a s...

Equivalent circuits containing frequency-variable radiation resistances are postulated for small monopole and small loop antennas above a ground plane. The equivalent circuits are valid below the fi rst natural resonance frequency. By adding an external series inductance or a parallel capacitance, the antenna’s Q is evaluated with the use of an invariant form for the refl ection coeffi cient. T...

A common exercise in empirical studies is a "robustness check," where the researcher examines how certain "core" regression coe¢ cient estimates behave when the regression speci…cation is modi…ed by adding or removing regressors. If the coe¢ cients are plausible and robust, this is commonly interpreted as evidence of structural validity. Here, we study when and how one can infer structural vali...

This paper aimed at investigating the potential use of sperm DNA fragmentation (SDF) to improve the routine screening of infertility of Holstein bulls. Cryopreserved sperm samples from 201 Holstein bulls provided by an AI center were used in the analyses of SDF at 0 (SDF_0) and 6 (SDF_6) h of incubation at 37oC. A refi nement of the sperm chromatin dispersion test implemented in the Sperm-Halom...

A new straightforward design of a special class of elliptic IIR lters is presented. The major goal is the complexity reduction of the realized digital lter. The multiplier coe cients are implemented with limited number of shift-and-add operations. This method is also called "multiplierless". Unlike classical design, a closed-form relations are derived giving relationships between the lter speci...

For the usual st raight·line model, in whic h the independent variable ta kes on a fixed, kno wn se t of va lues, it is shown that the sample corre lation coeffi cie nt is distributed as Q with (n-2) degrees of freedom and noncentralit y O=({3 /CT) V~(Xi X)2. The Q variate has been defin ed and studied e lse· where by Hogben et al. It is noted that the square of the correlation coeffi cient is ...

We classify the Q-multiplicity-free skew Schur Q-functions. Towards this result, we also provide new relations between the shifted Littlewood-Richardson coeffi-

We discuss robust estimates based on leverage downweighting of the coe cients in logistic regression case-control studies when the true predictor X is an unobserved continuous random variable, and instead a surrogateW is observed with nondi erential measurement error. The asymptotic theory of the estimates is derived, and consistent standard error estimates obtained. An illustrative example sho...