Description
The efficiency of the rank correlation test is 0.91. What does that value tell us about the test?
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r = 0.91
What does this tell us?
To interpret the value of r you need to follow these guidelines:
- r always lies in the range -1 to +1. If it lies close to either of these two values, then the dispersion of the scattergram points is small and therefore a strong correlation exists between the two variables.
- For r to equal exactly -1 or +1 must mean that correlation is perfect and all the points on the scattergram lie on the line of best fit (otherwise known as the regression line.) If r is close to 0, the dispersion is large and the variables are uncorrelated. The positive or negative sign on the value of r indicates positive or negative correlation.
So in the above case, there is evidence of strong positive correlation.
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