Dose correlation is a statistical measure of the linear relation between a dose (a measure of medication) with some other variable which could be body mass of patient, or severity of ailment or length of treatment, etc.
A degree of correspondence or comparison between two math values.
Z Test
It mean that there is no correlation between the two variables. The variables are the same.
the value of a number that dose NOT match the value of the other.
The correlation coefficient is symmetrical with respect to X and Y i.e.The correlation coefficient is the geometric mean of the two regression coefficients. or .The correlation coefficient lies between -1 and 1. i.e. .