+ Reply to Thread
Results 1 to 3 of 3

Thread: My regression has me confused!

  1. #1
    Points: 4,351, Level: 42
    Level completed: 1%, Points required for next Level: 199

    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts

    My regression has me confused!




    Can someone help me explain this?

    I did a stepwise multiple regression using the three factors. In Step 3, it shows the Bs in the order I expected, but the Betas come out weighted differently, showing Factor Y to be most important. My questions…

    1. Why is this?

    2. How would I report Step 3? Do I say “When all the significant variables were incorporated and the results standardized, Factor Y was the most important.”

    Many thanks!



    B Std. Error Beta
    Step 1
    Factor X 0.68 0.08 0.52*

    Step 2
    Factor X 0.58 0.07 0.44*
    Factor Y 0.33 0.06 0.35*

    Step 3
    Factor X 0.44 0.08 0.34*
    Factor Y 0.38 0.05 0.39*
    Factor Z 0.31 0.08 0.24*

    Note. R2 = .268 for Step 1; ∆R2 = .114 for Step 2; ∆R2 = .048 for Step 3 (ps<.001). *p<.001

  2. #2
    TS Contributor
    Points: 17,636, Level: 84
    Level completed: 58%, Points required for next Level: 214
    JohnM's Avatar
    Posts
    1,948
    Thanks
    0
    Thanked 6 Times in 5 Posts
    This can be caused by multi-collinearity - in other words, the factors are correlated with each other to some degree (they're not totally independent of each other, like you would see in a designed experiment).

  3. #3
    Points: 4,351, Level: 42
    Level completed: 1%, Points required for next Level: 199

    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Thanks and a further question...


    I appreciate the info on multicollinearity. What would be the best way to explain this in the text?

    Thanks again!

+ Reply to Thread

           




Similar Threads

  1. Replies: 4
    Last Post: 11-06-2010, 01:05 PM
  2. Confused about a Simple Regression question
    By Jun in forum Statistics
    Replies: 0
    Last Post: 12-02-2009, 03:53 PM
  3. Im so confused...
    By rdl1905 in forum Statistics
    Replies: 1
    Last Post: 02-25-2009, 09:29 AM
  4. Confused about p-values with regression models
    By Jen1978 in forum Statistics
    Replies: 0
    Last Post: 07-22-2008, 10:22 AM
  5. I'm thoroughly confused
    By strykeforce in forum Statistics
    Replies: 0
    Last Post: 12-11-2007, 12:50 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats