What is an anomaly?

Giới thiệu về Anomaly Detection bằng R

Alastair Rushworth

Data Scientist

Defining the term anomaly

Anomaly: a data point or collection of data points that do not follow the same pattern or have the same structure as the rest of the data

Giới thiệu về Anomaly Detection bằng R

Point anomaly

  • A single data point
  • Unusual when compared to the rest of the data

 

Example: A single 30C daily high temperature among a set of ordinary spring days

summary(temperature)

   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
  18.00   20.45   22.45   22.30   22.98   30.00
Giới thiệu về Anomaly Detection bằng R

Visualizing point anomalies with a boxplot

boxplot(temperature, ylab = "Celsius")

Giới thiệu về Anomaly Detection bằng R

Collective anomaly

  • An anomalous collection of data instances
  • Unusual when considered together

 

Example: 10 consecutive high daily temperatures

Giới thiệu về Anomaly Detection bằng R

Let's practice!

Giới thiệu về Anomaly Detection bằng R

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