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list. use vs .net ean/ucc-13 generation tocreate ean-13 supplement 5 with .net GS1-8 Figure 5-1 Categorical variables selected for analysis E Click OK to run the procedure. 81 Examining Summary Statistics for Individual Variables Figure 5-2 Frequency tables The frequency tables are dis played in the Viewer window. The frequency tables reveal that only about 21% of the people own PDAs, but almost everybody owns a TV (99.2%).

This might not be an interesting revelation, although it might be interesting to find out more about the small group of people who do not own televisions.. Charts for Categorical Data You can graphically display the information in a frequency table with a bar chart or pie chart. E Open the Frequencies dialo GS1-13 for .NET g box again. (The two variables should still be selected.

). 82 5 . You can use the Dialog Recall button on the toolbar to quickly return to recently used procedures. Figure 5-3 Dialog Recall tool E Click Charts. E Select Bar Visual Studio .NET EAN/UCC-13 charts and then click Continue.

Figure 5-4 Frequencies Charts dialog box. E Click OK in the main dialog box to run the procedure. 83 Examining Summary Statistics for Individual Variables Figure 5-5 Bar chart In addition to the frequency tables, the same information is now displayed in the form of bar charts, making it easy to see that most people do not own PDAs but almost everyone owns a TV.. Summary Measures for Scale Variables There are many summary measu res available for scale variables, including:. Measures of central tendency. The most common measures of central tendency are the mean (arithmetic ave rage) and median (value above and below which half the cases fall).. Measures of dispersion. Statistics that measure the amount of variation or spread in the data include the standard deviation, minimum, and maximum. E Open the Frequencies dialog box again. 84 5 E Click Reset to clear any previous settings. E Select Household income in thousands (income) and move it into the Variable(s) list. Figure 5-6 Scale variable selected for analysis.

E Click Statistics. E Select EAN-13 for .NET Mean, Median, Std.

deviation, Minimum, and Maximum. Figure 5-7 Frequencies Statistics dialog box. E Click Continue. 85 Examining Summary Statist EAN/UCC-13 for .NET ics for Individual Variables E Deselect Display frequency tables in the main dialog box. (Frequency tables are usually.

not useful for scale variabl es since there may be almost as many distinct values as there are cases in the data file.). E Click OK to run the procedure. The Frequencies Statistics table is displayed in the Viewer window. Figure 5-8 Frequencies Statistics table In this example, there is a large difference between the mean and the median, with the mean being more than 25,000 greater than the median. This indicates that the values are not normally distributed. We can visually check the distribution with a histogram.

. 86 5 . Histograms for Scale Variables E Open the Frequencies dialo GTIN-13 for .NET g box again. E Click Charts.

E Select Histograms and With normal curve. Figure 5-9 Frequencies Charts dialog box. E Click Continue and click OK in the main dialog box to run the procedure. 87 Examining Summary Statistics for Individual Variables Figure 5-10 Histogram The majority of cases are cl ustered at the lower end of the scale, with most falling below 100,000. There are, however, a few cases in the 500,000 range and beyond (too few to even be visible without modifying the histogram). These high values for only a few cases have a significant effect on the mean but little or no effect on the median, making the median a better indicator of central tendency in this example.

. Working with Output The results from running a s tatistical procedure are displayed in the Viewer. The output produced can be statistical tables, charts or graphs, or text, depending on the choices you make when you run the procedure. This chapter uses the files viewertut.

spo and demo.sav..

Using the Viewer Figure 6-1 SPSS Viewer 90 6 . The Viewer window is divided into two panes. The outline pane contains an outline of all of the information stored in the Viewer. The contents pane contains statistical tables, charts, and text output.

Use the scrollbars to navigate through the window s contents, both vertically and horizontally. For easier navigation, click an item in the outline pane to display it in the contents pane. If you find that there isn t enough room in the Viewer to see an entire table or that the outline view is too narrow, you can easily resize the window.

. E Click and drag the right border of the outline pane to change its width. An open book icon in the out line pane indicates that it is currently visible in the Viewer, although it may not currently be in the visible portion of the contents pane.. E To hide a table or chart, double-click its book icon in the outline pane. The open book icon changes t o a closed book icon, signifying that the information associated with it is now hidden.. E To redisplay the hidden output, double-click the closed book icon. You can also hide all of the output from a particular statistical procedure or all of the output in the Viewer.. 91 Working with Output E Cli Visual Studio .NET UPC-13 ck the box with the minus sign ( ) to the left of the procedure whose results you. want to hide, or click the b ox next to the topmost item in the outline pane to hide all of the output..
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