I have an interesting data set and am trying to figure out the best way to analyze the data.  What I have are ~100 bilingual adults who have completed a naming test in both english and spanish.  The stimuli consist of 162 nouns and 100 verbs.  I intend to analyze noun and verb results separately since they have distinct linguistic differences.  However, I originally thought that perhaps I could run a Facets Analysis using english and spanish as the two facets.  My thinking is this would give me some measure of proficiency (i.e. ability) for naming in each language.  Am I taking Facets in a direction it was not intended?  Thank you for any input you may have.  neilad

Neilad: a "language" facet of two elements (1=English, 2=Spanish) would support differential item functioning of stimulus-by-language, and differential person functioning of blilingual-adult-by language. Is this what you want?

Yes, that is exactly what I was looking for.  Many thanks.  

Great, Neilad. Hope all goes well