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Consider an extreme case: you have only two observations. These are bound to give perfect correlation and lie on a line. However, there is no guarantee that this line gives the true relationship between the two variables. On the other hand, I would tend to be highly suspicious of almost any real data set giving perfect correlation. So , I guess that we need to know more about the source of the data. Bill ----- Original Message ----- From: <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, June 14, 2001 9:10 PM Subject: Correlation > A friend of mine has asked for help with the following problem: > > Suppose a scatter diagram has perfect positive correlation and the graph is > linear. Is there a proof that the equation of the line is y = a + bx? > > > Paul Marshall > School of Education and Professional Development > Leeds Metropolitan University > Beckett Park > LEEDS > LS6 3QS > Tel: +44 (0)113 2832600 ext 3794 > Email: work: [log in to unmask] home: [log in to unmask] > >