I’m assuming that by “line graph” you mean a scatterplot with the points connected by a line. The mechanics of creating the graph are pretty simple.
- Click the Graph icon in the tool shelf to make a graph.
- Drag a numeric attribute to each graph axis to create a scatterplot.
- Click the Ruler menu on the right side of the graph and choose “Connecting Lines.”
But your question suggests deeper concerns about making the graph easy to read and, perhaps, selecting data that lends itself to interpretation with line graphs. Perhaps you could say a bit more about what those concerns are?
Bill