New techniques and results of research of inter-regional differentiation on the basis of the principal components method

In the paper the techniques of the principal components method application to research of economic inequality and constructing of the regional development ratings have been proposed. This approach allows to research the structure and to determine the main direction of economic inequality of the studied systems. As an example the research of the inter-regional differentiation structure as well as construction of ratings of social and economic development of the Russian Federation subjects in 1998-2005 has been given.