ERIC Number: ED118604
Record Type: RIE
Publication Date: 1975-Oct
Reference Count: 0
Empirical Investigation of the Stradaptive Testing Model for the Measurement of Human Ability.
Waters, Brian K.
This study empirically investigated the validity and utility of the stratified adaptive computerized testing model (stradaptive]developed by Weiss (1973). The model presents a tailored testing strategy based on Binet IQ measurement theory and Lord's (1972) modern test theory. Nationally normed School and College Ability Test Verbal analogy items (SCAT-V) were used to construct an item pool. Item difficulty and discrimination indices were rescaled to normal ogive parameters on 249 items. Freshmen volunteers at Florida State University were randomly assigned to stradaptive or conventional test groups. Both groups were tested via cathode-ray-tube (CRT) terminals coupled to a Control Data Corporation 6500 computer. The conventional subjects took a SCAT-V test, while the stradaptive group took individually tailored tests drawn from the same item pool. Results showed significantly higher reliability for the stradaptive group, and equivalent validity indices between stradaptive and conventional groups. Three stradaptive testing strategies averaged 19.2, 26.5, and 31.5 items per subject as compared with 48.4 items per conventional subject. A 50% reduction from conventional test length produced an equal precision of measurement for stradaptive subjects. Item latency comparisons showed the stradaptive group required significantly longer per item than conventional group members. It is recommended that time rather then number of items be used in future adaptive research as a dependent variable. (Author/DEP)
Publication Type: Reports - Research
Education Level: N/A
Sponsor: Air Force Human Resources Lab., Brooks AFB, TX.
Authoring Institution: Air Force Human Resources Lab., Williams AFB, AZ. Flying Training Div.