
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 http://mathguru.freeforums.org/image...on_e_smile.gif gd forums

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 $\displaystyle \rightarrow 0$

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

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.