Fitting response surface models is usually carried out using statistical packages to solve complicated equations in order to produce the estimates of the model coefficients. This paper proposes a new procedure for fitting response surface models to mixed two-level and four-level factorial designs. New and easier formulae are suggested to calculate the linear, quadratic and the interaction coeff...

In order to assess the effect of Social Security reform on current and future workers, it is essential to accurately characterize the initial situations of representative workers affected by reform. For the purpose of analyzing typical reforms, the most important characteristic of a worker is the level and pattern of his or her preretirement earnings. Under the current system, pensions are dete...

This study estimates the earnings losses associated with workplace injuries that lead to permanent partial disability. Using unique administrative data from California, injured workers are matched to their co-workers with similar pre-injury earnings. Earnings loss is estimated as the difference in earnings between these two groups following injury. It is found that earnings losses are large. Mo...

This article presents replacement rates based on actual earnings for persons first receiving Social Security retired-worker benefits in the early 1980’s. One of the advantages of actual earnings replacement rates is that they reflect the complexities of real-life workers. Because there is no well-established procedure to calculate actual rates, several alternative definitions are used to show t...

We document that firms’ management of accounting earnings increased steadily from 1987 until the passage of the Sarbanes Oxley Act (SOX), with a significant increase during the period prior to SOX, followed by a significant decline after passage of SOX. However, the increase in earnings management preceding SOX was primarily in poorly performing industries. We also show that the informativeness...

The optimal managerial compensation contract is characterized in an environment in which the manager influences the distribution of earnings through an unobservable effort decision. Actual earnings, when realized, are private information observed only by the manager, who may engage in the costly manipulation of earnings reports. We derive the optimal contract that guarantees the manager non-neg...

How Immigrants Fare Across the Earnings Distribution: International Analyses This paper applies the quantile regression methodology to the study of the determinants of the distribution of earnings among the native born and immigrants in the United States and Australia. The analysis for immigrants is performed separately for those from Englishspeaking and non-English speaking origins. Using Cens...

cost by considering earnings quality for accepted companies in tehran stockexchange. this survey investigates a population of 76 companies during the timeperiod of 2009-2014. the results show that under high earnings quality, the marketrisk factor, the book risk to market factor, and the size risk factor have positiveeffects, and the profit risk factor has negative effects on shareholders equit...

This article examines changes in the age at which people claim Social Security retirement benefits in response to two recent changes in the Social Security rules: the removal of the retirement earnings test at ages 65 to 69 in 2000 and the gradual increase in the full retirement age (FRA) for those born in 1938 or later. Data come from the 1 percent sample of Social Security administrative data...