Cronbach's Alpha Calculator
Estimate raw Cronbach alpha from complete item response data with alpha if item deleted.
Cronbach's alpha
Enter data
Rows are respondents, columns are items.
| Metric | Value |
|---|
| Item | Variance | Alpha if deleted |
|---|
alpha = k/(k - 1) * (1 - sum(item variances) / total score variance)
How?
How this is calculated
This calculator uses raw Cronbach's alpha from complete numeric item responses. Item variances and total score variance use sample variance. Alpha if item deleted repeats the same formula after removing one item.
Formula: alpha = k/(k - 1) * (1 - sum(item variances) / total score variance)
Sources
- R psych alpha. R Documentation. Retrieved .
- Cronbach alpha overview. Wikipedia. Retrieved .
Method last reviewed