Summary
Objective
To evaluate the validity of the Self-assessment of Communication Competence – SACCom
by analyzing the communication competency of adult individuals using the item response
theory (IRT).
Methods
Overall, 778 individuals who responded to SACCom participated in this study. The initial
version consisted of 20 polytomous items regarding communication skills. Polytomous
answer keys to each item were ordered as follows: 1 - no, 2 - more or less, and 3
- yes. The IRT and the gradual response model, a 2-parameter logistic model for polytomous
items, were used for validation.
Results
Due to problems in the preliminary analysis using the item characteristic curve (ICC),
answer keys to SACCom items were reorganized in an ordinal dichotomous way. Response
1 was coded as 0 - no, while responses 2 and 3 were coded as 1 - yes. Item 9 of the
ICC was problematic and did not add information to the instrument; hence, this item
was excluded. SACCom, in its dichotomous format with 19 items, was unidimensional
according to the eigenvalues graph and tetrachoric correlation analysis. The Cronbach's
alpha coefficient showed an internal consistency value of 0.711. All item-total correlations
were greater than 0.284. Item discrimination parameters ranged from a = 0.563 to a = 1.505,
and the difficulty of the items ranged between b = –2.725 and b = 0.612. The likelihood
ratio test showed that the model without restrictions best fit the data. ICC gleaned
more information for individuals with lower communication skills.
Conclusion
The 19-item, dichotomous SACCom is valid for the analysis of communication skills
according to the IRT.
Key words
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Article info
Publication history
Published online: September 07, 2022
Accepted:
July 13,
2022
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2022 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
