Growth options and firm valuation

This paper studies the relation between firm value and a firm's growth options. We find strong empirical evidence that (average) Tobin's Q increases with firm-level volatility. However, the significance mainly comes from R&D firms, which have more growth options than non-R&D firms. By decomposing firm-level volatility into its systematic and unsystematic part, we also document that only idiosyncratic volatility (ivol) has a significant effect on valuation. Second, we analyze the relation of stock returns to realized contemporaneous idiosyncratic volatility and R&D expenses. Single sorting according to the size of idiosyncratic volatility, we only find a significant ivol anomaly for non-R&D portfolios, whereas in a four-factor model the portfolio alphas of R&D portfolios are all positive. Double sorting on idiosyncratic volatility and R&D expenses also reveals these differences between R&D and non-R&D firms. To simultaneously control for several explanatory variables, we also run panel regressions of portfolio alphas which confirm the relative importance of idiosyncratic volatility that is amplified by R&D expenses

An error estimate of Gaussian Recursive Filter in 3Dvar problem

Computational kernel of the three-dimensional variational data assimilation (3D-Var) problem is a linear system, generally solved by means of an iterative method. The most costly part of each iterative step is a matrix-vector product with a very large covariance matrix having Gaussian correlation structure. This operation may be interpreted as a Gaussian convolution, that is a very expensive numerical kernel. Recursive Filters (RFs) are a well known way to approximate the Gaussian convolution and are intensively applied in the meteorology, in the oceanography and in forecast models. In this paper, we deal with an oceanographic 3D-Var data assimilation scheme, named OceanVar, where the linear system is solved by using the Conjugate Gradient (GC) method by replacing, at each step, the Gaussian convolution with RFs. Here we give theoretical issues on the discrete convolution approximation with a first order (1st-RF) and a third order (3rd-RF) recursive filters. Numerical experiments confirm given error bounds and show the benefits, in terms of accuracy and performance, of the 3-rd RF.Comment: 9 page

Estimative for the size of the compactification radius of a one extra dimension Universe

In this work, we use the Casimir effect to probe the existence of one extra dimension. We begin by evaluating the Casimir pressure between two plates in a $M^4\times S^1$ manifold, and then use an appropriate statistical analysis in order to compare the theoretical expression with a recent experimental data and set bounds for the compactification radius

Schoolbooks and Shackles: The Undue Hardship Standard and Treatment of Student Debt at Bankruptcy

Individual debtors who file for Chapter 7 bankruptcy can discharge most of their pre-petition debts and emerge from bankruptcy with a financial “fresh start.” Student loan debt is one of the few exceptions to this general policy. Congress created the student loan discharge exception, 11 U.S.C. § 523(a)(8), to prevent student debtors from abusing the bankruptcy system. Specifically, Congress sought to prevent students who graduated from higher education programs from discharging their debts at bankruptcy, and then beginning lucrative careers. Congress, however, included an important carve-out to this exception for debtors whose loans impose an “undue hardship.” The undue hardship standard has created myriad problems for bankruptcy judges because Congress left the term undefined in the Bankruptcy Code. Thus, courts developed a variety of tests for undue hardship, most notably the Johnson, Bryant, Brunner, and Totality tests. The Brunner test, which the majority of bankruptcy courts apply, imposes an extremely demanding burden on debtors to show undue hardship. Today, with student debt and tuition costs reaching unprecedented levels, Congress should reconsider the Bankruptcy Code’s treatment of student debt. This Note argues that Congress should amend the Bankruptcy Code to define undue hardship based on the Totality test used by a minority of courts. This change would promote national uniformity and would give honest student debtors an attainable opportunity for student loan discharge. In the context of the modern student debt crisis, this relatively moderate reform would significantly help millions of student debtors

Oxytocin – ensuring appropriate use and balancing efficacy with safety

Maternal deaths due to haemorrhage continue to increase in South Africa (SA). It appears that oxytocin and other uterotonics are not being used optimally, even though they are an essential part of managing maternal haemorrhage. Oxytocin should be administered to every mother delivering in SA. Awareness is required of the side-effects that can occur and the appropriate measures to avoid harm from these. Second-line uterotonics should also be available and utilised in conjunction with mechanical and surgical means to arrest haemorrhage in women who continue to bleed after the appropriate administration of oxytocin