The paper examines the linkages between gender of household heads, education and household poverty in Nigeria between 1980 and 1996. Data analyzed were obtained from four national consumer expenditure surveys conducted in Nigeria in 1980, 1985, 1992 and 1996 by the Federal Office of Statistics. Adjustments were made for price differentials over time and across regions of the country. However, o...

Computing similarity between short microblogs is an important step in microblog recommendation. In this paper, we investigate a topic based approach and a WordNet based approach to estimate similarity scores between microblogs and recommend top related ones to users. Empirical study is conducted to compare their recommendation effectiveness using two evaluation measures. The results show that t...

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...

We investigate here how to treat numerically the Kendall functional equation occuring in the theory of branching processes and queueing theory. We discuss this question in the context of priority queueing systems with switchover times. In numerical analysis of such systems one deals with functional equations of the Kendall type and efficient numerical treatment of these is necessary in order to...