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Ordered-Categorical Data
Note: You can’t drag and drop between the Ordered categories list box and the
Unordered categories list box. You have to use the
Up and Down buttons to move a
category from one box to the other.
We could stop here and close the Ordered-Categorical Details dialog box because we
have the right number of boundaries and categories and we have the categories going
in the right order. However, we will make a further change based on a suggestion by
Croon (2002), who also worked with this dataset and concluded that the SD category
occurred so seldom that it should be combined with the D category. To merge those
two categories into a single category:
E Select the boundary between the two categories you want to merge.
E Click the Remove Boundary button. The Ordered categories list now looks like this:
Now the SD response and the D response are indistinguishable. Either response means
that the person who gave the response has a score that lies in the lowest interval on the
underlying numeric variable.
There remains the question of the values of the two boundaries that separate the
three intervals. If you do not specify values for the boundaries, Amos will estimate the
boundaries by assuming that scores on the underlying numeric variable are normally