The Pearson correlation coefficient Use the method most used to measure rxy is a relationship between two variables, or variables, or data set 2, it must be in the form of information in section antonphak or ratio (Interval or Ratio scale), such as the relationship between mental health and self care. To find out the relationship between the birth weight of the baby with the mother's age, etc. The Pearson correlation coefficient is used appropriately with a linear relationship only. Therefore, to calculate the r value = 0 if found to interpret that data may not correctly because it is possible that the information is relevant in other nonlinear effects (such as curves, etc.), so in the summary should summarize that data series 2, there are no linear relationship, it is more than obvious.
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