Overcoming the effects of differential skewness of test items in scale construction
SA Journal of Industrial Psychology
| Field | Value | |
| Title | Overcoming the effects of differential skewness of test items in scale construction | |
| Creator | Schepers, Johann M. | |
| Description | The principal objective of the study was to develop a procedure for overcoming the effects of differential skewness of test items in scale construction. It was shown that the degree of skewness of test items places an upper limit on the correlations between the items, regardless of the contents of the items. If the items are ordered in terms of skewness the resulting inter correlation matrix forms a simplex or a pseudo simplex. Factoring such a matrix results in a multiplicity of factors, most of which are artifacts. A procedure for overcoming this problem was demonstrated with items from the Locus of Control Inventory (Schepers, 1995). The analysis was based on a sample of 1662 first year university students. Opsomming Die hoofdoel van die studie was om ’n prosedure te ontwikkel om die gevolge van differensiële skeefheid van toetsitems, in skaalkonstruksie, teen te werk. Daar is getoon dat die graad van skeefheid van toetsitems ’n boonste grens plaas op die korrelasies tussen die items ongeag die inhoud daarvan. Indien die items gerangskik word volgens graad van skeefheid, sal die interkorrelasiematriks van die items ’n simpleks of pseudosimpleks vorm. Indien so ’n matriks aan faktorontleding onderwerp word, lei dit tot ’n veelheid van faktore waarvan die meerderheid artefakte is. ’n Prosedure om hierdie probleem te bowe te kom, is gedemonstreer met behulp van die items van die Lokus van Beheer-vraelys (Schepers, 1995). Die ontledings is op ’n steekproef van 1662 eerstejaaruniversiteitstudente gebaseer. | |
| Publisher | AOSIS | |
| Date | 2004-10-26 | |
| Identifier | 10.4102/sajip.v30i4.170 | |
| Source | SA Journal of Industrial Psychology; Vol 30, No 4 (2004) 2071-0763 0258-5200 | |
| Language | eng | |
| Relation |
The following web links (URLs) may trigger a file download or direct you to an alternative webpage to gain access to a publication file format of the published article:
https://sajip.co.za/index.php/sajip/article/view/170/167
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