Below is an example of calculating reliability of one subscale among five subscales that measure personality. You should conduct the same steps for each subscale to measure their reliability and comment on them.
- In SPSS Choose “Analyze” then choose “Scale” then choose “Reliability Analysis”.
- In the Reliability Analysis window, move all items that intend to measure a specific subscale to the box on the right side and choose the method (Model).
- Coefficient alpha
- Split-half
- Parallel form
Output Tables
Write up:
The coefficient alpha or Cronbach alpha is interpreted as the degree to which all of the items measure a common construct. the Cronbach alpha of the items representing the factor openness to experience is .271 which is poor.
Sources:
https://openpsychometrics.org/tests/IPIP-BFFM https://ipip.ori.org/new_ipip-50-item-scale.htm
Reference:
Goldberg, L. R. (1992). The development of markers for the Big-Five factor structure. Psychological Assessment, 4(1), 26–42. https://doi.org/10.1037/1040-3590.4.1.26