How to create a chart: Click here to watch a tutorial OR on the left select multiple cities and then a single data series with which to compare those states for one or more years. The option on the right is to select multiple data series to be compared in one city. However, not all data series can be compared because they use different metrics and are expressed in different units. For example, the percentage of a population cannot be compared to dollars or rankings. If you are already looking at a chart and wish to change it or create a new one, click either "Edit Chart Criteria" or "Create Your Own Chart" below.