Exploratory Factor Analysis with SAS

Exercises

1. Describe the conceptual meaning of Cronbach’s alpha. If your scale has α = 0.85, how do you interpret that number?
2. Replicate the estimation of alpha and the item-total correlations for the GDS data presented in text and Figure 11.5 Alpha and item-total correlations for the GDS data. Then replicate the estimation of bootstrapped CI for the subsample of N=50 presented in Alphas and 95% CI for three subsamples and Item-total correlations and 95% CI for three subsamples. Use a seed of 3 and simple random sampling to replicate the selection of the N=50 sample. Then use a seed of 5 and 2000 resamples to estimate bootstrapped CI. By setting the seed values, you should find that your results match those presented in the tables exactly. ...