Chapter 6

1. What are the properties of a time series?

Answer:

• Trend: This refers to the long-term direction of the data. For example, the data can have a positive growth known as an upward trend, or it can have a negative growth known as a downward trend, or the data could also plateau.
• Variations: This refers to the peaks and troughs in the data.
• Seasonality: This refers to reoccurring patterns at regular intervals.
• Cycles: These are like seasonality meaning there is a consistent pattern, but the patterns are not consistent at regular time intervals.

2. What operator can we use to generate a time series?

Answer: The make-series operator.

3. Can you fill in the blanks of this query to display the number of patches installed in the last 30 days and render the results as a time chart?

   let startTime = ago(____);
   let endTime = now();
   let binSize = 7d;
   Update
   | where Classification == "Security Updates"
   | make-series security_updates...