Reliability and Validity
Reliability & Validity of Our Career Assessment Instruments
Our assessment instruments include inventories that measure interests,
values, skills and abilities, personality type, leisure time interests,
and career planning readiness. Our data analysis is based on several
groups of system users as follows:
|High School Students
|Adults in Career Transition
|Prisoners, Parolees, Persons on Probation
|Youth Development Services - Teenagers
Statistical Methods Used:
Item-scale correlations and item-factor analyses were calculated for all samples.
Reliability Measures: Two measures of reliability were computed, one for
internal reliability (Alpha coefficient), and one for stability (test-retest).
Validity Measures: Content Validity and Construct Validity were assessed for all sets of items.
Content validity was established by (1) examining the face validity of items (2) reviewing the
theoretical models and methods used to develop the items, and (3) item-scale correlations. Construct
validity was established by comparing the results of the factor analysis across the different
samples. The essential question was, did the factor structure remain the same across the four
different population samples.
For all instruments, all items had factor analysis loadings reached or exceeded .67 on their
respective factors. Two measures of reliability were computed, one for internal reliability
(Alpha coefficient), and one for stability (test-retest). The reliability coefficients for
all items reached or exceeded .85. Close inspection of the factor structure across the
samples gives support to the construct validity.
Copyright 2013: Career Dimensions®, Inc.