Giving the fact that it only takes data from the past?
Hello again, Victor!
Great to have you in the course and thanks for reaching out!
Exactly – it takes data from the past, but makes predictions about the future, because time-series is one of the greatest tools to forecast future values and plot them on a graph.
If you are using time-series data for the past only, then it would be considered analysis, but in practice you usually do that to make predictions, and it is namely the expected (future) values a researcher cares for. Hence the way we’ve categorized this technique.
Hope this helps.