Question

The Joint Commission has told your Hospital CEO that they have found a Positive trend( Bad) between Knee Surgeries and Infections. They have used linear correlation to come up with these findings. He has asked you to write a paper on covariance so he will have a better understanding of their findings

Answer 1

Firstly, we should have basic idea about covariance and correlation that is given as,

A measure used to indicate the extent to which two random variables change in tandem is known as covariance. A measure used to represent how strongly two random variables are related known as correlation. Covariance is nothing but a measure of correlation. On the contrary, correlation refers to the scaled form of covariance. correlation is dimensionless, i.e. it is a unit-free measure of the relationship between variables. Covariance is affected by the change in scale.

If the covariance is know in between knee surgaries and infections then it will be more easy and better understanding to know the relation of report as compare to correlation becasue covariance is affected by the change in scale and covariance is unit measure of the relationship between variables.