QDA may refer to:
* Qualitative Data Analysis as used in
qualitative research
Qualitative research is a type of research that aims to gather and analyse non-numerical (descriptive) data in order to gain an understanding of individuals' social reality, including understanding their attitudes, beliefs, and motivation. This ...
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Quadratic discriminant analysis as used in statistical classification or as a quadratic classifier in machine learning
* The .QDA filename extension, used for Quadruple D archives
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