Correlation between Numerical Variables - Assumptions
7 important questions on Correlation between Numerical Variables - Assumptions
What are the assumptions for correlation analysis?
bivariate normal distribution
What is a bivariate normal distribution?
What are 3 features of X an Y to make up a bivariate distributions?
- The clouds of points of X and Y in a scatter plot has a circular of elliptical shape
- The frequency distributions of X and Y seperately are normal.
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What does effect correlations analysis the most in a bivarate normal distribution?
What are the 3 noticeable departures from bivariate normality in a scatter plot?
- presence of outliers
- a non-linear relationship between X and Y
What is the most noticeable departure from bivariate normality in a frequency distribution of X and Y?
What are the two options when the assumption of bivariate normality is not met?
2. Nonparametric methods.
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