“…Their presence only slightly affects the intercept estimates and regression coefficients but affects inference. When analyzing panel data, the fourth outlier category must be considered, namely blocking concentrated outliers that correspond to situations where most of the outermost observations are concentrated in a limited number of time series (Bramati andCroux, 2007 in Verardi &Wagner, 2010) Advances in Social Science,Education and Humanities Research,volume 292 Outlier detection using scatter plots and box plot, results in a scatter plot between Poverty, Fiscal Decentralization and Human Development Index with residual values, which can be seen in Figure VII. According to Soemartini (2007) based on the image above, there are several data that are located far from the overall data collection pattern, therefore indicating an outlier.…”