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Reporting on statistical validity relies on the interpretation and assessment of the researcher. However, there are ways to think about and report on the validity of your study that might help you collect better data as well as tell more accurate stories about your impact.
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Triangulation
This refers to finding data to support (or disprove) a result based on data from two or more sources. This helps control for various external factors that might influence results (e.g. procedural bias in an interview).
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