Results 1 to 4 of 4

Math Help - finding R^2 and R^2(bar)

  1. #1
    Newbie
    Joined
    Sep 2012
    From
    LA
    Posts
    9

    finding R^2 and R^2(bar)

    Hello,

    I have attached a picture of my problem (it is number 2 in the book). Ignore part a because I have managed to answer that. My problem is part b. It's my understanding that you need RSS and TSS to make the calculations, but they are not given in this question.

    Any pointers would be great,

    Thanks
    Attached Thumbnails Attached Thumbnails finding R^2 and R^2(bar)-20121013_195454.jpg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    3,807
    Thanks
    661

    Re: finding R^2 and R^2(bar)

    Hey Walowizard.

    Are you doing a statistics subject? The formulas for simple linear regression are well known and you either should have derived them (possibly in class with the lecturer) or they should be given to you.

    Is this the case? The formulas are very simple for the Y,X case but if you haven't done this I can give you some pointers.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2012
    From
    LA
    Posts
    9

    Re: finding R^2 and R^2(bar)

    I have the formula for:

    R= 1 - (RSS/TSS)

    TSS = (y-y(bar))^2
    ESS = (y(hat) - y(bar))^2
    RSS = (e-e(bar))^2

    For example, if I want RSS...... I do not know what "e" is, in order to plug it in the formula.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    3,807
    Thanks
    661

    Re: finding R^2 and R^2(bar)

    The e refer to the errors from the parameterized model to the real data.

    There are much simpler formulas though for a simple linear regression in that B0_hat = y_bar - B1_hat*x_bar and B1_hat = SXY/SXX where SXY = sum from 1 to n (x_i - x_bar)*(y_i - y_bar) and SXX = sum from 1 to n (x_i - x_bar)^2.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 5
    Last Post: August 4th 2012, 03:10 AM
  2. Replies: 10
    Last Post: December 8th 2011, 10:27 AM
  3. Replies: 1
    Last Post: July 3rd 2010, 10:40 PM
  4. Finding a limit. Finding Maclaurin series.
    Posted in the Calculus Forum
    Replies: 2
    Last Post: May 18th 2010, 10:04 PM
  5. Replies: 1
    Last Post: April 9th 2009, 09:02 AM

Search Tags


/mathhelpforum @mathhelpforum