chapter4 (2).pdf

chapter4 (2).pdf - DISCOVERING STATISTICS USING SPSS...

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DISCOVERING STATISTICS USING SPSS Chapter 4: Exploring data with graphs Oliver Twisted Please, Sir, can I have some more dimensions? We can use the same data set as in the previous example, but this time in the Chart Builder double-click on the simple 3-D scatter icon: The scatter/dot gallery The graph preview on the canvas differs from ones that we have seen before in that there is a third axis and a new drop zone ( ). It doesn t take a genius to work out that we simply repeat what we have done for other scatterplots by dragging another continuous variable into this new drop zone. So, select E xam Performance (%) from the variable list and drag it into the drop zone, and select ExamAnxiety and drag it into the drop zone. Now select Time Spent Revising in the variable list and drag it into the drop zone. Click on to produce the graph. Summary Point Plot Simple Dot Plot Scatterplot Matrix Grouped 3-D Scatter Simple 3-D Scatter Grouped Scatter Simple Scatter Drop-Line
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DISCOVERING STATISTICS USING SPSS Completed Chart Builder for a 3-D scatterplot A 3-D scatterplot is great for displaying data concisely; however, as the resulting scatterplot shows (see below), it can be quite difficult to interpret (can you really see what the relationship between exam revision and exam performance is?). As such, its usefulness in exploring data can be limited. However, you can try to improve the interpretability by changing the angle of rotation of the graph (it sometimes helps, and sometimes doesn t). To do this, double-click on the scatterplot in the SPSS Viewer to open it in the SPSS Chart Editor. Then click on in the Chart Editor to open the 3-D Rotation dialog box. You can change the values in this dialog box to achieve different views of data cloud. Have a play with the different values and see what happens; ultimately you ll have to decide which angle best represents the relationship for when you want to put the graph on a 2-D piece of paper! If you end up in some horrid pickle by putting random numbers in the 3-D Rotation dialog box then simply click on to restore the original view. What about if we wanted to split the data cloud on our 3-D plot into different groups? This is very simple (so simple that I m sure you can work it out for yourself); in the Chart Builder double-click on the grouped 3-D scatter icon. The graph preview on the canvas will look the same as for the simple 3-D scatterplot except that our old friend the drop zone is back. We can simply drag our categorical variable (in this case Gender ) into this drop zone.
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DISCOVERING STATISTICS USING SPSS A 3-D scatterplot of exam performance plotted against exam anxiety and the amount of time spent revising for the exam SELF TEST : Based on my minimal (and no doubt unhelpful) summary, produce a 3-D scatterplot of the same data in but with the data split by gender. To make things a bit more tricky, see if you can get SPSS to display different symbols for the two groups rather than two colours. A full guided answer is given below.
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  • Fall '19
  • Spss, Dialog box, Bar chart, RGB color model

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