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Psychological Statistics
Lesson 6: Correlation
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is a bivariate analysis that measures the strength of association between two variables and the direction of the relationship.
correlation
indicates a perfect degree of association between the two variables.
A value of ±1
the relationship between the two variables will be weaker
value goes toward 0
sign indicates a
positive
relationship
A +
sign indicates a negative relationship.
a
–
Four types of correlation
Pearson
correlation,
Kendall rank
correlation,
Spearman
correlation, and
Point Bi-serial
correlation.
A measure of the relationship between variables.
Correlation coefficient
The most common form for a relationship is a
straight line
The numerical value of the correlation measures the
strength
or
consistency
of the relationship.
Is the most widely used correlation statistic to measure the degree of relationship between linearly related variables.
Pearson r Correlation