Testing item reliability

Test the consistency of a set of items (variables).

1. Select a cell in the dataset.
2. On the Analyse-it ribbon tab, in the Statistical Analyses group, click Multivariate, and then click Cronbach's Alpha.
   The analysis task pane opens.
3. In the Variables list, select the variables.
4. If the variables have widely varying variances, select the Standardized check box.
5. To see the effect of each variable on the overall alpha, select the Effect of excluding each variable check box.
6. Click Calculate.