Spearman's rank correlation coefficient (Edexcel GCSE Statistics): Flashcards
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What does Spearman's rs measure?
What does Spearman's rs measure?
Strength of correlation between two ranked data sets.
Range of Spearman's rs values?
Range of Spearman's rs values?
Between -1 and 1, including endpoints.
Interpret rs close to -1?
Interpret rs close to -1?
Strong negative correlation, inverse relationship.
What if rs is 0?
What if rs is 0?
No correlation between the data variables.
What does a scatter diagram show?
What does a scatter diagram show?
Visual pattern of data, indicating correlation.
Describe a strong positive rs?
Describe a strong positive rs?
Close to +1, variables tend to increase together.
Describe a strong negative rs?
Describe a strong negative rs?
Close to -1, one variable increases as other decreases.
Why is rs=1.2 incorrect?
Why is rs=1.2 incorrect?
Coefficients must be between -1 and 1. Engineer error.
What does rs=0.75 indicate?
What does rs=0.75 indicate?
Strong positive correlation between two datasets.
Range check for rs?
Range check for rs?
Ensure rs is between -1 and +1.