Coefficient of range is also known as coefficient of dispersion

Coefficient of dispersion= (X

X

X

Coefficient of quartile deviation= (Q

Q

Q

If X and Y are two random variables then Coefficient of correlation

= {sum(x-mean of x)(y- mean of y)}/{sum(x- mean of x)

Coefficient of regression

={n*sum of x*y –(sum of x)(sum of y)}/{ n( sum of x

Coefficient of dispersion= (X

_{m}-X_{o})/(X_{m}+X_{o})X

_{m}= maximum value of dataX

_{o}=lowest value of dataCoefficient of quartile deviation= (Q

_{3}-Q_{1})/(Q_{3}+Q_{1})Q

_{3}= third quartileQ

_{1}=first quartileIf X and Y are two random variables then Coefficient of correlation

= {sum(x-mean of x)(y- mean of y)}/{sum(x- mean of x)

^{2}* sum(y- mean of y)^{2}}^{1/2}Coefficient of regression

={n*sum of x*y –(sum of x)(sum of y)}/{ n( sum of x

^{2})- (sum of x)^{2}}