Building a predictive model - what to look for?

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  • tacomax
    SBR Hall of Famer
    • 08-10-05
    • 9619

    #36
    Originally posted by BuddyBear
    That link does not even open up. Nice try though....
    You need to enroll in How To Click On A Link 101 next semester. Nice try though.

    Originally posted by BuddyBear
    Trust me....ANY variable you include will increase the R2. Go try it and tell me if it does not increase. That is a fact....
    Adding a variable almost invariably increases R2. It doesn't always increase - I suggest you read the quoted passage from the book. R2 is monotonically increasing - but that doesn't mean it's strictly monotonic.

    Since it's your word against someone who wrote a highly regarded book on econometrics, I suggest you take it up with the author and demand he make a correction.
    Last edited by tacomax; 04-03-08, 05:53 PM.
    Originally posted by pags11
    SBR would never get rid of me...ever...
    Originally posted by BuddyBear
    I'd probably most likely chose Pags to jack off too.
    Originally posted by curious
    taco is not a troll, he is a bubonic plague bacteria.
    Comment
    • tacomax
      SBR Hall of Famer
      • 08-10-05
      • 9619

      #37
      Originally posted by durito
      It opens up just fine for me. I'd been looking for a good online basic econometrics book. Thanks.
      No problems. It's a good little book and isn't so confusing if maths isn't your strong point.
      Originally posted by pags11
      SBR would never get rid of me...ever...
      Originally posted by BuddyBear
      I'd probably most likely chose Pags to jack off too.
      Originally posted by curious
      taco is not a troll, he is a bubonic plague bacteria.
      Comment
      • BuddyBear
        SBR Hall of Famer
        • 08-10-05
        • 7233

        #38
        Originally posted by tacomax
        You need to enroll in How To Click On A Link 101 next semester. Nice try though.



        Adding a variable almost invariably increases R2. It doesn't always increase - I suggest you read the quoted passage from the book. R2 is monotonically increasing - but that doesn't mean it's strictly monotonic.

        Since it's your word against someone who wrote a highly regarded book on econometrics, I suggest you take it up with the author and demand he make a correction.

        Sorry, but it ALWAYS increases it. Trust me, i've taken enough stats coures to know at least the basic things of multiple regression
        Comment
        • Ganchrow
          SBR Hall of Famer
          • 08-28-05
          • 5011

          #39
          Originally posted by BuddyBear
          Sorry, but it ALWAYS increases it.
          The R2 is only weakly increasing in the number of model regressors. There do exist pathological cases where the addition of a variable to a regression will have no effect on the coefficient of determination (R2). To wit:

          What if the variable being introduced were collinear with an existing variable?

          And as corollaries to the above:

          What if every observation of the introduced variable were identical and there already existed a constant term?

          With or without a constant term, what if the introduced variable were merely a column of 0s?

          What if the R2 of the regression were already 1?
          Comment
          • tacomax
            SBR Hall of Famer
            • 08-10-05
            • 9619

            #40
            I see what you're doing there, Ganch. But BuddyBear has taken lots of stats courses - that seemingly trumps actual statistical theory and pure logic.
            Originally posted by pags11
            SBR would never get rid of me...ever...
            Originally posted by BuddyBear
            I'd probably most likely chose Pags to jack off too.
            Originally posted by curious
            taco is not a troll, he is a bubonic plague bacteria.
            Comment
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