Results 1 to 4 of 4

Math Help - Residual plot

  1. #1
    Newbie
    Joined
    Jun 2009
    Posts
    12

    Residual plot

    hey guys, just working on residuals. first post and hopefully not the last :P
    so here the question much appriciation to however so helps
    note- im finding it extremely hard to intrepret which is of random scatter and which is of a pattern.

    which of the following residual plots shows that a linear model (the model used in the first place) is inappropriate to use to display the correlation between the two variables.

    A)http://www.studyit.org.nz/phpBB2/download.php?id=6140
    or
    B) http://www.studyit.org.nz/phpBB2/download.php?id=6141


    by the way hello gd forums
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    29
    The second residual plot has too many positive values to justitfy the regression suggested.

    For the regression model to be stable the sum of residuals \rightarrow 0
    Last edited by pickslides; June 27th 2009 at 04:32 PM. Reason: typo
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jun 2009
    Posts
    12
    hey thanks pickslides,

    just wondering though, in A can we state that there is no observable trend with the residuals? because it sort of seems like its got a decreasing trend, however the trend being extremely vague
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    29
    You cannot determine an increasing or decreasing trend from a residual plot.

    You are correct in saying the correlation is weak given the magnitude of each residual.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Residual Analysis
    Posted in the Advanced Statistics Forum
    Replies: 5
    Last Post: December 4th 2010, 07:57 PM
  2. Regression Residual Plot
    Posted in the Statistics Forum
    Replies: 1
    Last Post: May 30th 2010, 12:54 AM
  3. LSR , Residual problem
    Posted in the Statistics Forum
    Replies: 1
    Last Post: January 26th 2009, 09:45 PM
  4. How to find residual?
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: May 3rd 2008, 09:51 PM
  5. Residual Value??? Help!!
    Posted in the Business Math Forum
    Replies: 1
    Last Post: April 9th 2008, 09:30 PM

Search Tags


/mathhelpforum @mathhelpforum