Line charts show trends in data at equal intervals and are effective for comparing highs and lows in a continuum. Items on the y axis determine the height of the line, and items in the X-Categories itemize the line sections. You can create multiple lines by adding items to the Z-Category.
Line charts have one advantage over bar charts. They do not enable one set of data to obstruct the representation of another. Since lines are thin compared to bars, the data displayed in the front does not block out the data behind.
As a result, data that is not easily represented in bar or area charts work well in line charts. Many more dimensions of data can be superimposed without impairing the effectiveness of the chart.
