Unbalanced condition: 15%, 30%, and 45% DIF items favoring the reference
group; sample size varies from (250; 250) up to (1,500; 1,500); top row:
false alarm rates; bottom row: hit rates in the unbalanced
condition.
Note. DIF = differential item functioning; AO =
all-other selection; SA = single-anchor selection; NC = next candidate
selection.