This study investigates coefficient bias and heteroscedasticity resulting from scale differences in accounting levels‐based research designs analytically and using simulations based on accounting data. Findings indicate that including a scale proxy as an independent variable is more effective than deflation at mitigating coefficient bias, even if the proxy is 95 percent correlated with the true scale factor. In fact, deflation can worsen coefficient bias. Also, deflation often does not noticeably reduce heteroscedasticity and can decrease estimation efficiency. White (1980) standard errors are close to the true ones in regressions using undeflated variables. Replications of specifications in three recent accounting studies confirm the simulation findings. The findings suggest that when scale differences are of concern, accounting researchers should include a scale proxy as an independent variable and report inferences based on White standard errors. Résumé. Les auteurs examinent, tant sur le plan analytique qu'au moyen de simulations basées sur les données comptables, la distorsion des coefficients et l'hétéroscédasticité résultant des différences d'échelle dans les plans de recherche comptable basés sur les niveaux. Leurs constatations révèlent que l'inclusion d'un substitut d'échelle à titre de variable indépendante est plus efficace que la déflation pour atténuer la distorsion relative au coefficient, même si le substitut présente une corrélation de 95 pour cent avec le véritable facteur d'échelle. En fait, la déflation peut accentuer la distorsion relative au coefficient. Aussi, il arrive souvent que la déflation, sans réduire de façon appréciable l'hétéroscédasticité, puisse diminuer l'efficience de l'estimation. Les erreurs‐types de White (1980) se rapprochent des erreurs véritables dans les régressions faisant appel à des variables non déflatées. La répétition des mêmes caractéristiques dans trois études comptables récentes confirme les résultats de la simulation. Les conclusions de l'étude donnent à penser que lorsque les différences d'échelle sont sujet de préoccupation, les chercheurs en comptabilité devraient faire intervenir un substitut d'échelle à titre de variable indépendante et formuler les inférences à partir des erreurs‐types de White.

This paper develops and estimates a cost model for U.S. hospitals, analyzing the cost of excess bed capacity. A new estimate is worth making for at least two reasons. Recent changes in the economic environment of hospitals have caused their utilization rates to fall sharply, making previous estimates inaccurate. Second, we employ econometric techniques not previously applied to this problem, with estimation based on all short-term community hospitals from 1979-89. Our results, based on conservative estimates of the average optimal occupancy rate, indicate an annual cost of excess bed capacity of $17.2 billion in 1989, $24.1 billion in 1991, and over $25 billion in 1993.

This paper examines shares of fixed capital formation in GDP and rates of economic growth for more than 100 countries over successive five-year periods between 1965 and 1985 to determine the direction of causality between them. Simple regressions and multiple regressions including several standard determinants of growth, as well as a simple causality test, provide more evidence that increases in growth precede rises in rates of capital formation than that increases in capital formation precede increases in growth. High rates of fixed capital formation accompany rapid growth in per capita income, but we find no evidence that fixed investment is the only or main source of ignition for economic growth.

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Examines the effectiveness of two types of decision aids designed to alleviate the effects of one type of task-knowledge mismatch on auditors' judgments. Organization of audit planning tasks; Content and organization of auditors' knowledge; Specific processing problems caused by mismatch between task organization and knowledge organization.