Tag: educational assessment

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Point-Biserial, Phi Coefficient, Biserial, and Tetrachoric Correlation: 4 Important Types of Correlation

Posted onAuthorDr. Balaji NiwlikarLeave a comment

Introduction In psychological and educational research, not all variables are continuous. Many important variables — such as gender, pass/fail outcomes, yes/no responses, or item correctness — are dichotomous (i.e., having Read More …

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Percentiles, Percentile Ranks, and Standard Scores: 3 Important Concepts in Statistics

Posted onAuthorDr. Balaji NiwlikarLeave a comment

Introduction In psychological and educational measurement, one of the major challenges is interpreting individual performance in a way that is meaningful, accurate, and comparable across different tests, populations, and contexts. Read More …