A two-stage double-bootstrap data envelopment analysis of efficiency differences of New Zealand secondary schools

We conduct a two-stage (DEA and regression) analysis of the efficiency of New Zealand secondary schools. Unlike previous applications of two-stage semi-parametric modelling of the school “production process”, we use Simar and Wilson’s double bootstrap procedure, which permits valid inference in the presence of unknown serial correlation in the efficiency scores. We are therefore able to draw robust conclusions about a system that has undergone extensive reforms with respect to ideas high on the educational agenda such as decentralised school management and parental choice. Most importantly, we find that school type affects school efficiency and so too does teacher quality.     

Community-Based Wildlife Management (CWM) in Tanzania: Are the Communities Interested?

The fences-and-fines approach (the American National Park model) to wildlife protection is now perceived by many conservationists to have failed in Africa. An alternative approach whereby rural communities are given ownership rights or custodianship and management responsibilities for the resource has been introduced under the name Community-based Wildlife Management (CWM) (also known as Community-Based Conservation or CBC). This new approach is currently under experimentation in many parts of Africa. It is based on a number of assumptions, one being that the communities are interested and willing to conserve wildlife on their lands. Using the Selous Conservation Programme (SCP) in Tanzania and seven other African cases, this paper examines the plausibility of this assumption.     

Schizophrenie:Guter Charakter – böser Charakter?

Wie kann Pflege helfen? - Schizophrenie – eine der h?ufigsten Diagnosen in der station?ren Psychiatrie. Aber auch in anderen Fachbereichen betreuen Pflegende schizophrene Patienten. Wie verh?lt man sich gegenüber dieser Patientengruppe und mit welchen professionellen Hilfestellungen kann ihr am besten geholfen werden?     

Thousands of models,one story: Current account imbalances in the global economy

The global financial crisis has led to a revival of the empirical literature on current account imbalances. This paper contributes to that literature by investigating the importance of evaluating model and parameter uncertainty prior to reaching any firm conclusion. We explore three alternative econometric strategies: examining all models, selecting a few, and combining them all. Out of thousands (or indeed millions) of models a story emerges. The chance that current accounts were aligned with fundamentals prior to the financial crisis appears to be minimal.     

Structural properties of the price-to-earnings and price-to-book ratios

We examine the structural properties of a firm’s price-to-earnings (P/E) and price-to-book (P/B) ratios and the relation between these two ratios. A benchmark result is obtained under the hypothesis that firms use replacement cost accounting to value their operating assets, so that the P/B ratio coincides with Tobin’s q. The firm’s P/E ratio can then be expressed as a convex combination of the P/E ratios suggested respectively by the permanent earnings model and the Gordon growth model, with the relative weight to be placed on these two endpoints determined entirely by Tobin’s q. Under current financial reporting rules, the accounting for operating assets is likely to be more conservative than replacement cost accounting. Our findings characterize how the magnitude and behavior of the P/E and P/B ratios are jointly shaped by several key variables, including both past and anticipated future growth, economic profitability, and accounting conservatism     

The effect of leverage on the cost of capital of US buyouts

This paper addresses the problem to assess the effect of leverage on the cost of capital for buyout performance analyses. It draws on a unique and proprietary set of data on 133 US buyouts between 1984 and 2004. For each of them, we determine a public market equivalent that matches it with respect to its timing and its systematic risk. We show that under realistic mimicking conditions, the average cost of capital is below the commonly used benchmark S&P 500. Thereby, we control for two important aspects: for the risks taken by lenders in the buyout transactions (which affects the sponsors’ risks), and for the corresponding cost of debt (which lowers the return of the public market equivalent). Only with borrowing and lending at the risk-free rate is the average cost of capital close to the average index return. This finding is particularly important as existing literature on that topic tends to rely on benchmarks without a proper risk-adjustment.     

Portfolio selection with mental accounts and delegation

Das et al. (2010) develop an elegant framework where an investor selects portfolios within mental accounts but ends up holding an aggregate portfolio on the mean-variance frontier. This investor directly allocates the wealth in each account among available assets. In practice, however, investors often delegate the task of allocating wealth among assets to portfolio managers who seek to beat certain benchmarks. Accordingly, we extend their framework to the case where the investor allocates the wealth in each account among portfolio managers. Our contribution is threefold. First, we provide an analytical characterization of the existence and composition of the optimal portfolios within accounts and the aggregate portfolio. Second, we present conditions under which such portfolios are not on the mean-variance frontier, and conditions under which they are. Third, we show that the aforementioned analytical characterization is also applicable within the framework of Das et al. and thus improves upon their numerical approach.     

Why do firms go dark? Causes and economic consequences of voluntary SEC deregistrations

We examine a comprehensive sample of going-dark deregistrations where companies cease SEC reporting, but continue to trade publicly. We document a spike in going dark that is largely attributable to the Sarbanes–Oxley Act. Firms experience large negative abnormal returns when going dark. We find that many firms go dark due to poor future prospects, distress and increased compliance costs after SOX. But we also find evidence suggesting that controlling insiders take their firms dark to protect private control benefits and decrease outside scrutiny, particularly when governance and investor protection are weak. Finally, we show that going dark and going private are distinct economic events.     

A multi-factor Markovian HJM model for pricing American interest rate derivatives

This article presents a numerically efficient approach for constructing an interest rate lattice for multi-state variable multi-factor term structure models in the Makovian HJM [Econometrica 70 (1992) 77] framework based on Monte Carlo simulation and an advanced extension to the Markov Chain Approximation technique. The proposed method is a mix of Monte Carlo and lattice-based methods and combines the best from both of them. It provides significant computational advantages and flexibility with respect to many existing multi-factor model implementations for interest rates derivatives valuation and hedging in the HJM framework.

Never judge a book by its cover: what security analysts have to say beyond recommendations

Our study analyzes market reaction to the entire content of a large sample of analysts’ reports from the period 2002 to 2004 for the German market. In particular, we explore whether the three summary measures in the reports, i.e., recommendation revisions, earnings forecast revisions, and target price forecast revisions are acknowledged by the market. Additionally, we investigate if stated justifications in the written text of analysts’ reports contain information value beyond the three summary measures. We find that earnings forecast revisions and target price forecast revisions contain valuable information, both unconditionally and conditional on the rest of the information in the report. Our findings also reveal that justifications made by analysts are of high salience to market participants. These justifications provide valuable information, both unconditionally and conditional on all other types of information in a report. Our findings also suggest that business ties between banks and the analyzed companies do not affect market reaction to dissemination of an analysts’ report.