GR

• Bar Chart


  presenting nominal data

  The higher the bar, the more frequent that category of data is. Bars are separate to show that they represent distinct categories. If a category has a frequency of zero, this is still shown on the graph.
• Pie chart


  for presenting a nominal data so that each category with a frequency appears on the chart. The different segments represent different categories, with a segment representing a percentage or sometimes a fraction.
• Line Graph


  for presenting continuous data on a scale (ordinal, interval, ratio). The lines show the pattern of frequency. It is useful for comparing different conditions as a number of lines can be plotted on the same graph.
• Histogram


  for presenting continuous data on a scale – this is why bars are drawn touching each other. Histograms are an alternative to line graphs and are useful when there is a wide range of scores – scores can be grouped in intervals with as bar representing a group of scores rather than a single score.
• Scatter diagram


  for presenting correlations – one co-variable on each axis. Each axis needs a numerical scale and each point on the graph represents a pair of scores (or a single participant). Scatter diagrams show the strength and direction of a correlation.