Choosing Graph and Chart types
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The document discusses different types of graphs including bar/column graphs, line graphs, pie charts, and scatter plots. It provides examples of when each type of graph is most useful based on the type of data being displayed, such as trends over time, comparisons, or proportions. Guidelines are also provided for properly constructing and interpreting different graph types to effectively convey data visually.
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Choosing Graph and Chart types
- 2. Types of Graphs Types Why Bar/Column Trends Line Comparisons Pie Quicker/Easier to understand Scatter
- 3. Column or Bar 40 Unit 4 30 Unit 3 20 Unit 2 10 Unit 1 0 Unit 1 Unit 2 Unit 3 Unit 4 0 20 40 “Discrete” Data No half values on the category axis
- 4. Line Sales Staff Turnover 80 60 60 Tesco 40 40 Asda 20 20 0 0 2005 2006 2007 2008 2009 2010 Jan Feb March April Continuous data Often with time on X axis Trends
- 5. Pie Favourite Sports Class Gender Distribution Rugby Football Tennis Girls Cricket Boys Percentage and Proportion Only for full data sets
- 6. Scatter 20 10 15 10 5 5 0 0 0 2 4 6 8 10 0 2 4 6 8 10 “Trend line” or “Line of best fit” Experimental Results Looking for trends or correlation
- 7. Look out for… 100 50 0 Skewed range Compressed scale Incorrect range in Excel – e.g. including the total row
- 8. Choose Start Point 100 100 90 0