Spearman Rank Correlation Coefficient (AQA A-Level Geography): Flashcards
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Spearman rank correlation coefficient measures
Spearman rank correlation coefficient measures
Strength & direction of correlation between two variables
Range of Rs values
Range of Rs values
+1.0 (perfect positive) to -1.0 (perfect negative)
Correlation vs causation
Correlation vs causation
Correlation does not prove a causal link
'd' in Spearman formula represents
'd' in Spearman formula represents
Difference in ranking between paired data sets
'n' in Spearman formula represents
'n' in Spearman formula represents
Number of sets of paired data
Minimum sample size for Spearman rank
Minimum sample size for Spearman rank
At least 10 sets of paired data
Maximum sample size for Spearman rank
Maximum sample size for Spearman rank
No more than 30 sets of paired data
Positive correlation means
Positive correlation means
As one variable increases, the other also increases
Negative correlation means
Negative correlation means
As one variable increases, the other decreases
Key data requirement for Spearman rank
Key data requirement for Spearman rank
Data must be capable of being ranked highest to lowest