Pendekatan Lognormal pada Perhitungan Indeks Daya Beli Sebagai Salah Satu Komponen Indeks Pembangunan Manusia

Abstract

Lognormal method is an alternative approach that can be used if there is skewness in data. Expenditure per capita, which is used for calculating Purchasing Power Index (PPI) as a component of Human Development Index (HDI), is an example of a data that is skewed to the right. Lognormal transformation that is applied on data that is skewed to the right can be used to improve the symetry of skewed data and overcome non normality problems. In this study, the lognormal approach has been used in the calculation of PPI as an alternative method of Central Bureau of Statistic (CBS). In province of West Java, BPS method obtained an average PPI of 58.920 and HDI of 71.323, while lognormal method obtained an average PPI of 59.240 and HDI of 71.430. The difference between the results that are not too large, indicating that lognormal approach can be used as an alternative for PPI calculation.