Before revision: [Coefficient alpha=number of items2 x average correlation between different items/sum of all correlations in the correlation matrix (including 1s )] For better practices, keep the final factors and all loadings of yours and similar scales selected to be used in the Appendix of one's scale.
After revision: [Coefficient alpha=number of items2 x average correlation between different items/sum of all correlations in the correlation matrix (including the diagonal values )] For better practices, keep the final factors and all loadings of yours and similar scales selected to be used in the Appendix of one's scale.