To create a trend analysis in your report:
• Click on "Add a table" or "Add a graph"
• Insert the name of the table or graph
• Select "Trend analysis" as type of analysis
• Select one or more questions you want to use
• Set the parametres of the trend analysis: the frequency, the starting and ending date...
• Then choose the type of analysis to apply
• Then click on "Create" to generate the table or graph