Berkman, E. T., & Reise, S. P. (2012). Descriptive statistics. In A Conceptual Guide to Statistics Using SPSS (pp. 5-18). SAGE Publications, Inc., https://doi.org/10.4135/9781506335254 Read Chapter 2.
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Rana, J., Gutierrez, P.L., Oldroyd, J.C. (2021). Quantitative Methods. In: Farazmand, A. (eds) Global Encyclopedia of Public Administration, Public Policy, and Governance. Springer, Cham. https://doi.org/10.1007/978-3-319-31816-5_460-1.