Plotting numbers on a chart does not make you a data analyst. Knowing and understanding your data before you communicate it to your audience does. Understanding data is challenging and this chapter is designed to help you understand these important ideas:
Aggregated data is data combined from several measurements for the purpose of summarization.1 Some of the uses for data aggregation include:
This section will help you understand whether data can be aggregated, some basic aggregation methods, and things to watch out for.
When working with aggregation, it is important to avoid metrics that aggregate data that is already aggregated. What does this mean?
Aggregating summarized data to a higher level will often work. However, there are aggregations you cannot aggregate further without additional data. It takes time and practice to understand data aggregation. To aid you ...