PLOT Subcommand (OVERALS command)

PLOT can be used to produce plots of transformations, object scores, coordinates, centroids, and component loadings.

  • If PLOT is not specified, plots of the object scores and component loadings are produced.

The following keywords can be specified on PLOT:

LOADINGS. Plot of the component loadings.

OBJECT. Plot of the object scores.

TRANS. Plot of category quantifications.

QUANT. Plot of all category coordinates.

CENTROID. Plot of all category centroids.

DEFAULT. OBJECT and LOADINGS.

NONE. No plots.

  • Keywords OBJECT, QUANT, and CENTROID can each be followed by a variable list in parentheses to indicate that plots should be labeled with these variables. For QUANT and CENTROID, the variables must be specified on both the VARIABLES and ANALYSIS subcommands. For OBJECT, the variables must be specified on VARIABLES but need not appear on ANALYSIS, meaning that variables that are not used in the computations can still be used to label OBJECT plots. If the variable list is omitted, the default plots are produced.
  • Object score plots use category labels corresponding to all categories within the defined range. Objects in a category that is outside the defined range are labeled with the label corresponding to the category immediately following the defined maximum category.
  • If TRANS is followed by a variable list, only plots for those variables are produced. If a variable list is not specified, plots are produced for each variable.
  • All keywords except NONE can be followed by an integer in parentheses to indicate how many characters of the variable or value label are to be used on the plot. (If you specified a variable list after OBJECT, CENTROID, TRANS, or QUANT, you can specify the value in parentheses after the list.) The value can range from 1 to 20. If the value is omitted, 12 characters are used. Spaces between words count as characters.
  • If a variable label is missing, the variable name is used for that variable. If a value label is missing, the actual value is used.
  • Make sure that your variable and value labels are unique by at least one letter in order to distinguish them on the plots.
  • When points overlap, the points are described in a summary following the plot.

In addition to the plot keywords, the following keyword can be specified:

NDIM. Dimension pairs to be plotted. NDIM is followed by a pair of values in parentheses. If NDIM is not specified, plots are produced for dimension 1 versus dimension 2.

  • The first value indicates the dimension that is plotted against all higher dimensions. This value can be any integer from 1 to the number of dimensions minus 1.
  • The second value indicates the highest dimension to be used in plotting the dimension pairs. This value can be any integer from 2 to the number of dimensions.
  • Keyword ALL can be used instead of the first value to indicate that all dimensions are paired with higher dimensions.
  • Keyword MAX can be used instead of the second value to indicate that plots should be produced up to and including the highest dimension fit by the procedure.

Example

OVERALS COLA1 COLA2 JUICE1 JUICE2 (4)
/ANALYSIS=COLA1 COLA2 JUICE1 JUICE2 (SNOM)
/SETS=2(2,2)
/PLOT NDIM(1,3) QUANT(5).
  • The NDIM(1,3) specification indicates that plots should be produced for two dimension pairs—dimension 1 versus dimension 2 and dimension 1 versus dimension 3.
  • QUANT requests plots of the category quantifications. The (5) specification indicates that the first five characters of the value labels are to be used on the plots.

Example

OVERALS COLA1 COLA2 JUICE1 JUICE2 (4)
/ANALYSIS=COLA1 COLA2 JUICE1 JUICE2 (SNOM)
/SETS=2(2,2)
/PLOT NDIM(ALL,3) QUANT(5).
  • This plot is the same as above except for the ALL specification following NDIM, which indicates that all possible pairs up to the second value should be plotted. QUANT plots will be produced for dimension 1 versus dimension 2, dimension 2 versus dimension 3, and dimension 1 versus dimension 3.