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11 Cards in this Set

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Positive relationship
A relationship between two variables where increases in one variable tend to be accompanied by increases in the other variable.
Negative relationship
A relationship between two variables where increases in one variable tend to be accompanied by decreases in the other variable.
Perfect relationship
A relationship where the actual data points perfectly fit the specific form being measured. For a Pearson correlation, the data points fit perfectly on a straight line.
Sum of products
A measure of the degree of covariability between two variables; the degree to which they vary together
Pearson correlation
A measure of the direction and degree of linear relationship between two variables
Significance of a correlation
A demonstration that a sample correlation so large that it is very unlikely to have come from a population where the correlation is zero.
Coefficient of determination
The degree to the variability in one variable can be predicted by its relationship with another variable: measured by r squared
Spearman correlation
A correlation calculated for ordinal data. Also used to measure the consistency of direction for a relationship
Monotonic relation
A relationship that is consistently one-directional
Point-bacterial correlation
A correlation between two variables where one of the variables is dichotomous
Phi-coefficient
A correlation between two variables both of which are dichotomous