Tag Archives: Correlation coefficient

Anscombe’s Quartet

Here’s an interesting example of why you should never just look at an r value and a regression model without looking at the scatterplot first. Anscombe’s Quartet consists of four data sets. Each has the same sample size and nearly the same mean and standard deviation for the x and y variables, r values, and regression coefficients. But […]

Pearson Correlation Coefficient (r)

The Pearson Correlation Coefficient (or the Pearson Product Moment Correlation) is the measure of the strength of the linear association between two quantitative variables. The formula is: , where and are the standard scores for x and y that show how many standard deviations x and y are from the mean and n is the […]

Pearson Correlation Coefficient (r)

The Pearson Correlation Coefficient is a measurement of correlation between two quantitative variables, giving a value between -1 and 1 inclusive. This correlation demonstrates the degree to which the variables are dependent on one another. In other words, if the value of r is 1 or -1, then that means that all of the data points lie […]