Dear Donald Burrill,
I'd love to know how did you plotted the following graphs. I don't
think it was plotted in R or s-plus. where did you plot it and how?
To be honest, i was about to conclude that we seem to have no pattern
in the standardized residual plot; that is, the standardized residuals
do appear to be randomly distributed about 0; which is good according
to our theory. This means, residuals do not change in any systematic
way with X.
But then you mentioned that residuals are generally positive at
either end of the range of X, and negative in the middle : which seems
to be true if we look at the plot carefully; but what does it mean?
Now, how can i conclude it !!
NB:(If we plot a standardized residual plot we get all points with in
-2 to +2 in Y-axis.)
Ehsan
_______________________
Mohammad Ehsanul Karim <[EMAIL PROTECTED]>
Institute of Statistical Research and Training
University of Dhaka, Dhaka- 1000, Bangladesh
_______________________
[EMAIL PROTECTED] (Donald Burrill) wrote in message news:<[EMAIL PROTECTED]>...
> Have you plotted your data? There appears to be some possibly
> interesting structure in it: residuals are generally positive at either
> end of the range of X, and negative in the middle. Does that mean
> anything, do you think?
> Here is your original data, Y vs. X:
>
>
> Y -
> - *
> - * *
> 100000+
> -
> - *
> -
> - *
> 80000+
> - *
> - * *
> - *
> -
> 60000+ *
> - *
> - * *
> -
> ------+---------+---------+---------+---------+---------+X
> 105.0 110.0 115.0 120.0 125.0 130.0
>
> Here are the residuals, plotted vs. X:
>
> -
> - *
> 4000+ *
> -
> Resid - * * * *
> -
> - * *
> 0+ ------+---------+---------+---------+---------+---------+ X
> - *
> -
> -
> -
> -4000+ * *
> -
> - *
> -
> - *
> ------+---------+---------+---------+---------+---------+ X
> 105.0 110.0 115.0 120.0 125.0 130.0
>
>
> -----------------------------------------------------------------------
> Donald F. Burrill [EMAIL PROTECTED]
> 56 Sebbins Pond Drive, Bedford, NH 03110 (603) 626-0816
>
> .
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