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Discussion: Nonparametric estimation of noisy integral equations of the second kind
Stefan Sperlich 한국통계학회 2009 Journal of the Korean Statistical Society Vol.38 No.2
This is a discussion of the paper ``Nonparametric estimation of noisy integral equations of the second kind'' by Enno Mammen and Kyusang Yu.
Income Inequality in the South-South Integration
( Yvonne Sperlich ),( Stefan Sperlich ) 세종대학교 경제통합연구소 2014 Journal of Economic Integration Vol.29 No.4
Some of the findings from new trade and economic geography theory are quite critical concerning the South-South agreements. This study contributes to the discussion by means of different empirical analyses of a representative set of South-South integrations. The income developments of its member states are studied with a special focus on income dispersion between and within member states. The results show that income dispersion has slightly decreased, within and between member states. The findings are placed in relation to growth models and beta convergence as other studies have found ambivalent results for growth and convergence in South-South integration areas.
Further theoretical and practical insight to the do-validated bandwidth selector
Enno Mammen,María Dolores Martínez Miranda,Jens Perch Nielsen,Stefan Sperlich 한국통계학회 2014 Journal of the Korean Statistical Society Vol.43 No.3
Recent contributions to kernel smoothing show that the performance of cross-validatedbandwidth selectors improves significantly from indirectness and that the recent dovalidatedmethod seems to provide the most practical alternative among these methods. Inthis paper we show step by step how classical cross-validation improves in theory, as wellas in practice, from indirectness and that do-validated estimators improve in theory, butnot in practice, from further indirectness. This paper therefore provides a strong support forthe practical and theoretical properties of do-validated bandwidth selection. Do-validationis currently being introduced to survival analysis in a number of contexts and this paperprovides evidence that this might be the immediate step forward.