A Step by Step Guide for SPSS and Exercise Studies

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Data handling 33 Dialog box 30 new variable (column) will appear in the data file showing the mean scores of all five competence items. In a similar way, other numeric expressions can also be used to compute a new variable which will represent, for example, the sum or the product of existing variables (Dialog box 30). Compute is also useful when you want to create a new variable which will code the cases of an existing variable into different groups (useful for parametric t tests, ANOVA, and MANOVA; see the Analyze menu). Suppose you want to code an intention to do physical activity (intent) variable into two groups: those with high intention (code 1) and those with low intention (code 2). To split the variable into these two groups you need to find out its median value (see Summarize Frequencies in the Analyze menu below). Suppose the median value is 3.7 on a 1 (‘I certainly do not intend to do exercise’) to 5 (‘I certainly intend to do exercise’) continuum. The new variable will be named intention groups, or intengro, since you are restricted to 8 characters. In the Numeric Expression box, type 1 (Dialog box 31). Click If at the bottom of the dialog box. In the new dialog box that appears (Dialog box 32) select Include if case satisfies condition. Move the variable intent in the upper right-hand box and type intent>3.7, because you want to assign the code 1 to those with high intention (i.e., those who score above the median). Click OK. Now return to Dialog box 31. Click OK and a new variable will appear in the data file called intengro which contains the value 1. However, you also want to include in this variable those with low intention to exercise. Follow the same procedure by typing 2 in the Numeric Expression box of Dialog box 31. Then in Dialog box 32 type intent 3.7 (or intent < 3.7, if you do not want to include the median score). Click Continue and then OK. A new dialog box will appear (Dialog box 33) which will ask you whether you want to change the existing variable (i.e., intengro). Click OK because you want to change it so that it contains the values of both 1 and 2.
34 Data handling Dialog box 31 Dialog box 32 Dialog box 33 You can also use the Compute option to create a new categorical variable which will be the combination of two existing variables (useful for ANOVA and MANOVA; see the Analyze menu). Suppose you have measured the number of sit-ups and press-ups in 60 seconds of a group of athletes, and you want to create a new variable called strength which will combine the sit-up and press-up
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Page 8 and 9: Contents Preface Acknowledgements x
Page 10 and 11: Contents 4 Chart and table options
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Page 14: Acknowledgements The comments and s
Page 17 and 18: 2 Introduction variety of options a
Page 19 and 20: 4 Introduction Data Entry Each row
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252 Index discriminant analysis 2,
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