How do I plot multiple data sets on one graph?

To plot multiple data sets on one graph, use different colours or symbols for each data set.

When plotting multiple data sets on a single graph, it's important to make sure each set is easily distinguishable. Start by choosing a type of graph that suits your data, such as a line graph, bar chart, or scatter plot. For example, if you're comparing temperature and rainfall over a year, a line graph might be the best choice.

Next, assign a unique colour or symbol to each data set. For instance, you could use a red line for temperature and a blue line for rainfall. If you're using a bar chart, you might use different shades or patterns for each set. In a scatter plot, different shapes like circles, squares, or triangles can represent different data sets.

Label your axes clearly, indicating what each axis represents. For example, the x-axis might show months of the year, while the y-axis shows temperature in degrees Celsius and rainfall in millimetres. Make sure to include a legend on your graph. The legend explains what each colour or symbol represents, helping viewers understand the data at a glance.

If your data sets have different units, consider using a secondary y-axis. This is a second vertical axis on the right side of the graph, which can have a different scale. For example, you could plot temperature on the left y-axis and rainfall on the right y-axis. This way, both data sets can be displayed on the same graph without confusion.

Finally, ensure your graph is neat and easy to read. Avoid clutter by not overcrowding the graph with too many data sets. If necessary, create multiple graphs to present your data clearly. By following these steps, you can effectively compare and analyse multiple data sets on a single graph.