环境数据分析课件 (25).pdf
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1、Chapter 8 Analysis of CorrelationCorrelation depends only on participants as we assumed?Contents Analysis of correlation The methods for the analysis of correlation:Bi-variances Partial correlation Distant correlationCorrelation analysis is a statistical method used to evaluate the extent to two or
2、more quantitative variables.Moreover,the correlation is the process of studying the strength of that relationship with available statistical data and also its direction.Analysis of CorrelationAnalysis of Correlation-1.0Negative+1.0Positive0.0Strong WeakWeak StrongStrength and direction of correlatio
3、n-0.3+0.3A high correlation means two or more variables have a strong relationship while a weak correlation means that the variables are hardly related.Correlation coefficient(donated r)Guideline only!-0.7+0.7Very weakModerateStrongVery weakModerateStrongAnalysis of CorrelationAssumption of Correlation Assumption:Linear relationshipPearson correlation,Kendall rank correlation and Spearman correlationRandomly selected;normally-distributed;homogeneity of varianceAnalysis of Correlation
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