Facets supports two methods for building a profile of person measures across subdimensions or subtests in one analysis.
1. Person-by-subdimension/subtest interactions. (Easy to implement.)
| a. | each item is identified with its subdimension |
| b. | a standard person facet is specified |
| c. | the subdimensions are specified as a facet |
| d. | the data contain element numbers for item, person, subdimension |
| e. | a standard analysis is performed |
| f. | a person-by-subdimension bias/interaction analysis is performed. |
| g. | the person profile across subdimensions is:
person measure + person-by-subdimension interaction measure |
2. Person subdimension measures. (Complex to implement)
| a. | each item is identified with its subdimension |
| b. | a standard person facet is specified |
| c. | a facet is specified with an element for every person-by-subdimension pairing. |
| d. | the person-by-subdimension elements are group-anchored at zero for each person |
| e. | the data contain element numbers for item, person, person-by-subdimension |
| f. | a standard analysis is performed. |
| g. | the person profile across subdimensions is:
person measure + person-by-subdimension measure |
Method 2 approximates the approach in S. Brandt (2010) "Estimating Tests Including Subtests", Journal of Applied Measurement, 11, 4, 352-367.