In Mathematica 7.0 the following input produces output -1.
Correlation[{1, 3, 5}, {6, 4, 2}]
In the Statistics tab of Fast Introduction for Math Students the same input produces output 7.
Has the definition of the Correlation function changed?
In[1]:= Correlation[{1, 3, 5}, {6, 4, 2}]
Out[1]= -1
In[2]:= $Version
Out[2]= "11.0.1 for Microsoft Windows (64-bit) (September 20, 2016)"
Yes, that is what I see in version 7. But check here:
http://www.wolfram.com/language/fast-introduction-for-math-students/statistics/
I think the output of 7 might be a wrong..
I’m still on version 10.3 but I get the same result
Correlation[{1, 3, 5}, {6, 4, 2}]
= -1
I also solved the correlation without using a computer and it was -1… Not sure if this helps. I’m sure someone else will chime in.. A correlation can only be between -1
Yes, I also get -1 using the definitions given in the Mathematica documentation. I agree that 7 is probably an error. My Mathematica is seven years old, and I just wanted to make sure somebody had not decided to change a definition. Thanks for your interest and help.