Decomposition of cumulative chi-squared statistics,with some new tools for their interpretation

It is well known that the Pearson statistic \(\chi ^{2}\) can perform poorly in studying the association between ordinal categorical variables. Taguchi’s and Hirotsu’s statistics have been introduced in the literature as simple alternatives to Pearson’s chi-squared test for contingency tables with ordered categorical variables. The aim of this paper is to shed new light on these statistics, stressing their interpretations and characteristics, providing in this way new and different interpretations of these statistics. Moreover, a theoretical scheme is developed showing the links between the different proposals and classes of cumulative chi-squared statistical tests, starting from a unifying index of heterogeneity, unalikeability and variability measures. Users of statistics may find it attractive to understand well the different proposals. Some decompositions of both statistics are also highlighted. This paper presents a case study of optimizing the polysilicon deposition process in a very large-scale integrated circuit, to identify the optimal combination of factor levels. It is obtained by means of the information coming from a correspondence analysis based on Taguchi’s statistic and regression models for binary dependent variables. A new optimal combination of factor levels is obtained, different from many others proposed in the literature for this data.     

Job Flows and Plant Size Dynamics: Traditional Measures and Alternative Econometric Techniques

This paper measures the relation between job flows and establishment size, applying econometric techniques best suited for analyzing the long‐run dynamics of large cross‐section. Using a balanced panel from the Mexican manufacturing sector, it shows that, in line with existing evidence, initially small firms create proportionally more jobs than large firms. Since these results suffer from regression toward the mean, the paper applies an alternative technique and does not find any long‐run tendency of small establishments converging toward the mean. Furthermore, it shows how cross‐sectional dynamics across industries varies, and how it is linked to gross and net flows in each sector. Convergence to the mean is observed in relatively stable industries, with asymmetric dynamic behavior between expanding and declining industries.