1 LOF (Local Outlier Factor)

2 참고자료

library(DMwR)
x <- df1$dau
y <- df1$used_cash
outlier.scores.y <- lofactor(y, k=5)
outlier.scores.x <- lofactor(x, k=5)
#plot(density(outlier.scores))
tmp <- data.frame(x, y, outlier.scores.y, outlier.scores.x)
tmp <- tmp[tmp$outlier.scores.x <= 2 & tmp$outlier.scores.y <= 2, ]
x <- tmp$x
y <- tmp$y

• http://www.rdatamining.com/examples/outlier-detection
  
• Outlier detection and treatment with R(https://www.r-bloggers.com/outlier-detection-and-treatment-with-r/)
  
• Outliers Detection and Intervention Analysis(https://www.r-bloggers.com/outliers-detection-and-intervention-analysis/)