Chapter 10: Bivariate Analysis
Links to a carefully curated collection of Youtube videos provide a host of additional sourcs for you to develop your ability to use R software in an engaging and accessible manner.
Video 10.1: ‘Chi-square test, Fisher’s exact test, and cross tabulations in R’
Question 1: When is it appropriate to use a Chi-square test?
Answer: When we want to test the independence (or relationship) between two categorical variables.
Question 2: If we just want to perform a Chi-square test, how do we do it in R?
Answer: We use the chi.square() function in R.
Video 10.2: ‘Correlation and covariance in R’
Question 1: What is the difference between a Pearson’s correlation and a Spearman’s correlation?
Answer: Pearson’s correlation assesses a linear association between 2 numeric variables, while Spearman’s correlation assesses a monotonic association between 2 numeric variables.
Question 2: What is the default type of correlation in the cor() function in R?
Answer: The default is Pearson’s correlation.