There are several classifications of research methodologies used in nursing research. Some of the common classification categories include:

1. Quantitative Research Methods: These methods involve the collection and analysis of numerical data to answer research questions. Examples of quantitative research methodologies used in nursing research include experimental studies, survey research, and correlational studies.

2. Qualitative Research Methods: These methods involve the collection and analysis of non-numerical data, such as interviews, observations, and text analysis. Qualitative research methodologies used in nursing research include phenomenology, grounded theory, ethnography, and case study.

3. Mixed Methods Research: This approach combines both quantitative and qualitative research methods in a single study to gain a deeper understanding of a research question. It involves collecting and analyzing both numerical and non-numerical data.

4. Experimental Research: This research design involves manipulating variables and measuring the effects of these manipulations on outcomes. Experimental studies often involve random assignment to control and experimental groups to determine cause and effect relationships.

5. Observational Research: This type of research involves observing and recording behavior or phenomena without manipulating variables. Observational research can be either naturalistic (observing behavior in real-world settings) or structured (using specific protocols and instruments to observe and record behavior).

6. Systematic Review: Systematic reviews involve the synthesis of existing research studies on a specific research question or topic. This method includes a systematic search, selection, and critical appraisal of relevant studies to provide a comprehensive summary and analysis of the available evidence.

7. Descriptive Research: Descriptive research aims to describe the characteristics of a particular population or phenomenon. It typically involves collecting data through surveys, interviews, or observations and analyzing it to reveal patterns and trends.

8. Case Study: Case studies involve an in-depth examination of a particular individual, group, or organization. This methodology is often used to explore rare or unique phenomena and generate rich qualitative data.

These are just a few examples of the classification of research methodologies used in nursing research. The choice of methodology depends on the research question, the nature of the phenomenon under investigation, and the available resources.

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