A THEORETICAL STUDY OF TWO‐STAGE TESTING1
Frederic M. Lord · ETS Research Bulletin Series · 1969
ABSTRACT When items cannot be answered correctly by guessing, certain two‐stage testing procedures are about as effective over the ability range of interest as the “best” up‐and‐down procedures studied previously. When answers can be guessed correctly 20 percent of the time, no two‐stage procedure is found to match the “best” up‐and‐down procedures over this ability range. Feet‐on‐the‐desk designs for two‐stage procedures may produce poor results.