EKS index and international comparisons

Köves, Pál (1999) EKS index and international comparisons. Hungarian Statistical Review, 77 (SN3). pp. 3-14. ISSN 0039-0690

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Abstract

The EKS (Éltető – Köves – Szulc) index formula (hereinafter referred to as X) is in official use in the comparison of per capita real GDP and purchasing power parity of the OECD countries. Early versions of formula X can be found in Fisher’s and Gini’s works. According to the author, X can be regarded as the result of a multi-situational crossing. It is the geometric mean of the ‘generalized F’ and its factor-antithesis. The three-member index family obtained this way shows a close relationship to J. van Yzeren’s three indices (family Y). The paper presents an empirical procedure to measure the similarity of the behaviour and performance of the different index formulae. The author comes to the conclusion that the members of families X and Y walk around index X.

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