Positive, Negative and Zero Correlation
When one talks about correlation terms such as positive negative and zero often come up. These three words have nothing to do with how strong or weak two categories correlate.
When someone says something has weak correlation it simply means the two set of numbers relate relate inversely. This means as one category is going up the other is going down.
When something has positive of correlation the two sets of numbers go up and down together.
Lastly when something has zero correlation it means that the two sets of numbers do not rise and fall together and they do not head in opposite directions. They simply do not correlate at all.
Below I have posted a link to an online article discussing correlation. It gives a good summery of each of the three types of correlation. It goes a little more in depth than I went and it is considerably longer than my summery. The second article is very similar to the first. It just provides a more in depth synopsis than I have provided.
Example:
http://www.simplypsychology.org/correlation.html
http://psychology.about.com/od/cindex/g/def_correlation.htm
When someone says something has weak correlation it simply means the two set of numbers relate relate inversely. This means as one category is going up the other is going down.
When something has positive of correlation the two sets of numbers go up and down together.
Lastly when something has zero correlation it means that the two sets of numbers do not rise and fall together and they do not head in opposite directions. They simply do not correlate at all.
Below I have posted a link to an online article discussing correlation. It gives a good summery of each of the three types of correlation. It goes a little more in depth than I went and it is considerably longer than my summery. The second article is very similar to the first. It just provides a more in depth synopsis than I have provided.
Example:
http://www.simplypsychology.org/correlation.html
http://psychology.about.com/od/cindex/g/def_correlation.htm