Question

How is an outlier identified on a residual plot?

Answer 1

In statistics, an outlier is a data point that significantly differs from the other data points in a sample. Often, outliers in a data set can alert statisticians to experimental abnormalities or errors in the measurements taken, which may cause them to omit the outliers from the data set. If they do omit outliers from their data set, significant changes in the conclusions drawn from the study may result.[1] Because of this, knowing how to calculate and assess outliers is important for ensuring proper understanding of statistical data.