i wanted to use both quantitative and qualitative data in conducting ex post facto research
Being pragmatic is governed by practicality, i.e., collecting data using approaches that best address the research question(s). In ex post facto research (i.e., after-the-fact investigation), used when controlling the treatment variable is infeasible or unacceptable, a pragmatic sequential mixed methods design (Mertens, 2019) could come in handy. In particular, you might consider the exploratory sequential mixed methods design (Creswell & Plano Clark, 2018), in which the qualitative stage is the basis for the quantitative stage. You could go through the study by Killian and Wilkins (2009) to grasp how they implemented the sequential design in their ex post facto study. Full citations are as follows.
Creswell, J. W., & Plano Clark, V. L. (2018). Designing and conducting mixed methods research (3rd ed.). SAGE Publications. https://us.sagepub.com/en-us/nam/designing-and-conducting-mixed-methods-research/book241842
Killian, J. E., & Wilkins, E. A. (2009). Characteristics of highly effective cooperating teachers: A study of their backgrounds and preparation. Action in Teacher Education, 30(4), 67–83. https://doi.org/10.1080/01626620.2009.10734453
Mertens, D. M. (2019). Research and evaluation in education and psychology: Integrating diversity with quantitative, qualitative, and mixed methods (5th ed.). SAGE Publications. https://us.sagepub.com/en-us/nam/research-and-evaluation-in-education-and-psychology/book259357
Good luck,
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