When improving a process quality using Six Sigma methodology, sigma metric as a measure of quality is introduced. The metric is computed using a special table which converts defects per million opportunities (dpmo) to sigma level. The article shows that when sigma quality of a process is under...

This article describes the trend of income distributions in Czech Republic over the years 1995-2008. There is not social economy study on the topic incomes. We analyze time series of incomes over these years. The income distributions and their trends are analyzed over all Czech Republic, next...