Measuring Relationships: The Pearson r Product Moment Coefficient of Correlation

Pearson r

Photo source: http://bit.ly/1qBAAVF

The Pearson r Product Moment Coefficient of Correlation is the most common measure of correlation or association. The computation can be used for determining the relationship between two variables with paired observations. The r value can have possible values between -1 to +1. The closer the r value is to -/+ 1, the stronger is the relationship between the two variables. Consequently, as the r value approaches 0, the relationship gets weaker.

In the following example, Pearson r is used in order to determine the influence of the number of hospitals in a city to its maternal mortality rate (MMR).

Credits:

http://www.une.edu.au/WebStat/unit_materials/c4_descriptive_statistics/pearsons_coeff.html

http://www.thefreedictionary.com/Pearson%27s+r

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s