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Summary Statistics and Case Values



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Кратко ръководство за SPSS
Свързани:
1. Age Restriction Условие (1), Geo, Септември, Роберт Чалдини - Влиянието - Психология на убеждаването, Архитектура и планиране
Summary Statistics and Case Values.
You can choose one of the following alternatives for exclusion of cases having missing values:
Exclude listwise to obtain a consistent base for the chart.
If any of the variables in the chart has a missing value for a given case, the whole case is excluded from the chart.
Exclude variable-by-variable to maximize the use of the data.
If a selected variable has any missing values, the cases having those missing values are excluded when the variable is analyzed.
To see the difference between listwise and variable-by-variable exclusion of missing values, consider the following figures, which show a bar chart for each of the two options.


Figure 28-7 Listwise exclusion of missing values



Figure 28-8 Variable-by-variable exclusion of missing values


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The charts were created from a version of the Employee data.sav file that was edited to have some system-missing (blank) values in the variables for current salary and job category. In some other cases, the value
0 was entered and defined as missing. For both charts, the option
Display groups defined by missing values is selected, which adds the category Missing to the other displayed job categories. In each chart, the values of the summary function, Number of cases, are displayed in the bar labels.
In both charts, 26 cases have a system-missing value for the job category, and 13 cases have the user-missing value (0). In the listwise chart, the number of cases is the same for both variables in each bar cluster because whenever a value was missing, the case was excluded for all variables. In the variable-by-variable chart, the number of nonmissing cases for each variable in a category is plotted without regard to missing values in other variables.
Templates
A chart template allows you to apply the attributes of one chart to another. When you open a chart in the Chart Editor, you can save it as a template. You can then apply that template by specifying it at creation or later by applying it in the Chart Editor.


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