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Missing Data
The resulting dataset is in the SPSS Statistics file Grant_x.sav. Below are the first few
cases in that file. A period (.) represents a missing value.
Amos recognizes the periods in SPSS Statistics datasets and treats them as missing
data.
Amos recognizes missing data in many other data formats as well. For instance, in
an ASCII dataset, two consecutive delimiters indicate a missing value. The seven cases
shown above would look like this in ASCII format:
visperc,cubes,lozenges,paragraph,sentence,wordmean
33,,17,8,17,10
30,,20,,,18
,33,36,,25,41
28,,,10,18,11
,,25,,11,,8
20,25,6,9,,,,
17,21,6,5,10,10
Approximately 27% of the data in Grant_x.sav are missing. Complete data are
available for only seven cases.
Specifying the Model
We will now fit the common factor analysis model of Example 8 (shown on p. 272) to
the Holzinger and Swineford data in the file Grant_x.sav. The difference between this
analysis and the one in Example 8 is that this time 27% of the data are missing.