PubMed · 1525289
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D F Klein. 1992-06-01. Correlational versus experimental studies.. https://doi.org/10.1016/0006-3223(92)90173-w
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Using graphical and statistical approaches, Laszlo Endrenyi and Mayank Patel describe methods that answer two frequently asked questions: 'Can the data be characterized by a single straight line, or should a more complex model be invoked?' and 'Do the observations follow a single normal distribution, or is there evidence for deviations from this assumption, including the possibility of bimodality?" These methods complement those addressed in a recent Principles article by Dick Barlow.