×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Correlation

Correlation

Correlation

(OP)
This might be a very simple question. I want to know if ANY relatation exists at all between two arrays. A correlation I read determines only if a linear relationship exists. Please correct me if I am wrong about this. I can plot the data in excel and try all the fitting functions and check the R^2 value. But I am sure there are other methods for this. Online search suggests solutions such as copula, correlation ratio etc but I could not find an example of how to implement it. Any help is useful. Thanks


Joe
 

RE: Correlation

AT the level at which I work the usual trick is to transform x2 so that it is a linear function of x1, and then apply the normal (sorry) statistics to the transformed x2 values

I don't think one exists for the general case where x2=f(x1) and f could be almost anything.

The reason I say that is things like the equation for a circle, where there clearly is a correlation, but no trend.

However I will happily admit that I am out of my depth.

 

Cheers

Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close