Anomaly Definitions
You can define one or more anomaly detection jobs on a dataset. The anomaly detection job can monitor a measure at an aggregate level or split the measure by a dimension.
To define an anomaly job, you
Select a dataset
Select a measure from the dataset
Select a dimension to split the measure (optional)
Select an anomaly rule
Split Measure by Dimension
Measure [Dimension Limit ] [High/Low]
To split a measure by a dimension, select the dimension and then limit the number of unique dimension values you want to split into.
Choose the optional High/Low to detect only one type of anomalies. Choose High for an increase in measure or Low for a drop in measure.
Limit Dimension Values
When you split a measure by a dimension, you must limit the number of unique dimension values. There are 3 ways to limit - Top N, Min % Contribution, and Min Avg Value.
Top N
Top N limits the number of dimension values based on the dimension value's contribution to the measure.
Say you want to monitor Orders measure. But you want to monitor it for your top 10 states only. You would then define anomaly something like below:
Min % Contribution
Minimum % Contribution limits the number of dimension values based on the dimension value's contribution to the measure.
Say you want to monitor Orders measure for every state that contributed at least 2% to the total Orders, your anomaly definition would look something like below:
Min Avg Value
Minimum Average Value limits the number of dimension values based on the measure's average value.
In the example above, only states where average(Orders) >= 10 will be selected. If your granularity is daily, this means daily average orders. If your granularity is hourly, this means hourly average orders.
Anomaly Detection Algorithms
CueObserve offers the following algorithms for anomaly detection.
Prophet
Percentage Change
Lifetime High/Low
Value Threshold
Prophet
This algorithm uses the open-source Prophet procedure to generate a forecast for the timeseries. It then compares the actual value with the forecasted value. If the actual value is outside the forecast's confidence range (grey band in the image below), it marks the actual value as an anomalous data point.
The metric's percentage deviation (45% in the image below) is calculated with respect to the threshold of the forecast's confidence range.
Percentage Change
This algorithm compares the metric's actual value with its previous value in the timeseries. For example, for a timeseries with daily granularity, it will compare the value on 15th August with the value on 14th August.
If the percentage change is higher than the specified threshold, it marks the recent value as an anomalous data point.
Lifetime High/Low
This algorithm finds the metric's highest and lowest values in the timeseries. It marks these data points as anomalous data points.
Value Threshold
This algorithm identifies anomalous data points in the timeseries as per the mathematical rule specified in the anomaly definition screen. Below are a few sample rules:
Anomaly when Value greater than X
Anomaly when Value not between X and Y
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