2016 Volume 24 Issue 2 Pages 33-45
Genichi Taguchi described the role of quality engineering as freeing society from the need to predict, diagnose, and decide. In The Limits to Growth, the first report issued by the Club of Rome, Dennis Meadows et al. sounded the alarm by warning that if population growth and environmental destruction continued unabated, mankind's growth would reach its limit within 100 years due to depletion of resources and deterioration of the environment. In an initial report on research, inspired by the proposals of the Club of Rome, in which the Mahalanobis-Taguchi system was used to study changes in national census data, we showed that the distances of the error root mean square for each nation for each year displayed characteristic national traits with time-series trends. In this second report, the implications of the error root mean square in distinguishing unstable nations and developed nations from the features of each nation are studied in relation to itemized diagnostics by the MT system. The result is that, from the features of the gain of the percent of total population aged 65 or over' item, if positive and negative signs are assigned to the error root mean square distance, it is possible to distinguish between unstable nations and developed nations and use the MT system to understand the time-series changes for each nation.
