Outliers
Identify outliers using modified Z-score
outliers(x, s = 1.4826)
x |
A numeric vector |
s |
Scaling factor for mad statistic |
value for the modified Z-score
Jeffrey S. Evans <jeffrey_evans@tnc.org>
Iglewicz, B. & D.C. Hoaglin (1993) How to Detect and Handle Outliers, American Society for Quality Control, Milwaukee, WI.
# Create data with 3 outliers
x <- seq(0.1, 5, length=100)
x[98:100] <- c(100, 55, 250)
# Calculate Z score
Z <- outliers(x)
# Show number of extreme outliers using Z-score
length(Z[Z > 9.9])
# Remove extreme outliers
x <- x[-which(Z > 9.9)]Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.