Exploring Data in Two Dimensions |
Line Plots of Selected Variables
If one or more variables are selected in a data table when you select Graph Line Plot, then the line plot dialog box (Figure 6.12) does not appear. Instead, a line plot is created. The rules for constructing the line plot are as follows:
- If one variable is selected, create a line plot of versus .
- If exactly two variables are selected, the first is used as the Y variable and the second as the X variable.
- If there are variables selected, then count the number of selected nominal variables.
- If no nominal variables are selected, create a line plot of versus .
- If there are nominal variables selected, then count the number of selected interval variables.
- If there are no interval variables selected, then plot the first selected variables as Y, plot the second selected variables as X, and use the remaining selected variables as group variables.
- If there is exactly one interval variable, then plot it as Y if it was chosen first, and otherwise plot it as X. The first nominal variable is assigned to the X or Y role, and the remaining selected variables are used as group variables.
- If there are exactly two interval variables, then plot the first selected interval variable as Y, plot the second as X, and use the remaining selected variables as group variables.
- If there are more than two interval variables, then ignore the nominal variables and plot the interval variables as in rule 1.
Variables with a Frequency or Weight role are ignored when you are creating line plots.
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