
Let y = a + b y ..... (1) where a and b are given by the normal equations
S y =
n a + b S x ..... (2)
Sxy =
a S
x + b S x^{2} ....
(3)
where ‘ n ’ be the number of pairs of values of x and y.
Equation (6) is the equation of the line of regression of
y on x.

Index
6. 1 Introduction
6. 2 Correlation
6. 3 Types of Correlation
6. 4 Degrees of Correlation
6. 5 Methods of determining correlation
6. 6 Coefficients of Correlation for Bivariate
Grouped Data
6. 7 Probable Error
6. 8 Rank Correlation Coefficient
6. 9 Linear Regression
Chapter 7
