6.5.3 Understanding the Trends view In the Trends view (Figure 6-14)  the frequency of the selected time period is  shown as a bar chart. It is scaled accordingly from 0 to the maximum frequency  count along the vertical y-axis on the left side.  On the right side of the y-axis is a scale that represents the increase indicator.  The  increase indicator   also known as trend index  is a scale to measure the  increase ratio of the frequency for a given time interval as compared to the  expected average frequency that is calculated based on the changes in the past  time interval frequencies. This expected change in frequency is estimated by  using a modified Poisson distribution. The increase indicator is shown as a blue  line graph in the chart  as shown in Figure 6-14. The bar chart is in color (to highlight) whether the increase indicator is higher  than what was expected within reasonable limits. This result means that the  actual value is greater than the estimated value by a certain amount. Figure 6-14  shows a brighter orange color for December 2008. As you can see from the blue  line in the graph  the increase indicator shows a sudden jump  which means that  you might want to conduct additional investigation and analysis for that time  period. Figure 6-14 Trends view: Pine juice with frequency count and increase indicator 180  IBM Watson Content Analytics: Discovering Actionable Insight from Your Content Frequency count Increase indicator