This article examines one important component of the problem of implementing the federal government's Clean Air policy, namely, the difficulty of quantifying the rela­ tionship between emissions to the atmosphere and ambient air quality. Short·, middle·, and long.tenn contt"ol strategies are discussed with an emphasis on the information needed for their effective assessment and implemeDlation. ...

In this study, we report empirical results from forecasting field defect rates and predicting the number of field defects for a large commercial software system. We find that we are not able to accurately forecast field defect rates using a combined time-based and metrics-based approach, as judged by the Theil forecasting statistic. We suggest possible conditions that may have contributed to th...

In this paper, the use of queueing theory for modeling uninterrupted traffic flows is evaluated. Empirical data on speeds and flows are used to evaluate speeds generated by the different queueing models. Using the Theil inequality coefficient as evaluation criterion, the speeds generated by the queueing models are compared to the empirical speeds. Queueing models that best fit the observed spee...

The paper deals with three approaches to comparing the regression lines corresponding to two dependent groups when using a robust estimator. The focus is on the Theil–Sen estimator with some comments about alternative estimators that might be used. The first approach is to test the global hypothesis that the two groups have equal intercepts and slopes in a manner that allows a heteroscedastic e...

Despite a long period of research on the relationship between competition and innovation, contradictory observations about their have been reported there is yet no consensus this relationship. Moreover, few studies how affected by characteristics companies participating in market. In article, we aim to examine innovation activities, particularly pharmaceutical industry, investigate moderated si...

Building upon the ideas first exposed by Theil and Finizza (1971) and Fuchs (1975), this paper presents an additively decomposable segregation index based on the entropy concept used in information theory. For any pair of classification variables in a given year, the index is decomposed into a between-group and a withingroup term. To analyze intertemporal changes in gender segregation for a giv...

dx. The construction of the schemes involves an appropriate extension of Eyre’s idea of convex-concave decomposition of the energy functional. As an application, we derive unconditionally stable and convergent schemes for epitaxial film growth models with slope selection (F (y) = 1 4 (|y| − 1)) and without slope selection (F (y) = − 1 2 ln(1 + |y|)). We conclude the paper with some preliminary ...

An aggregation rule maps each profile of individual strict preference orderings over a set of alternatives into a social ordering over that set. We call such a rule strategyproof if misreporting one’s preference never produces a different social ordering that is between the original ordering and one’s own preference. After describing two examples of manipulable rules, we study in some detail th...