________________________________
Dear liang.che,
I'm guessing that this is the qqPlot() function in the car package.
This looks to me to be the combination of two problems: (1) You have at
least one observation in your model for which the leverage (hat-value)
is 1.
That could happen, for example, if you have a factor in the model with
only
one observation at a particular level. (2) qqPlot() isn't handling that
degenerate situation properly.
Not only did I have to guess that you're using qqPlot() in the car
package,
but I had to guess what the problem is. If you read the text from r-help
at
the bottom of your message, you'll see that it says, "provide commented,
minimal, self-contained, reproducible code." If you'd like help beyond
my
remarks above, you're more likely to get it if you provide the commands
and
data for your problem. Of course, we'll take a look at qqPlot() to see
whether it's doing something unreasonable, and fix it if we find a
problem.
Best,
John
-----------------------------------------------
John Fox
Senator McMaster Professor of Social Statistics
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org <mailto:r-help-bounces at r-project.org> ]
On Behalf Of liang.che at us.pwc.com
Sent: Sunday, November 04, 2012 1:31 PM
To: r-help at r-project.org
Subject: [R] 95% Q-Q Plot error message
Can someone please help with the error message below?
Warning messages:
1: Not plotting observations with leverage one:
7
2: Not plotting observations with leverage one:
7
print(qqPlot(fit),envelop=.95);
Error in model.frame.default(formula = Y ~ X - 1, drop.unused.levels =
TRUE) :
variable lengths differ (found for 'X')
In addition: Warning message:
In matrix(yhat, n, reps) :
data length [9] is not a sub-multiple or multiple of the number of
rows
[8]
Thanks!
______________________________________________________________________
The information transmitted, including any attachments, is intended
only
for the person or entity to which it is addressed and may contain
confidential and/or privileged material. Any review, retransmission,
dissemination or other use of, or taking of any action in reliance
upon,
this information by persons or entities other than the intended
recipient is prohibited, and all liability arising therefrom is
disclaimed. If you received this in error, please contact the sender
and
delete the material from any computer. PricewaterhouseCoopers LLP is a
Delaware limited liability partnership. This communication may come
from PricewaterhouseCoopers LLP or one of its subsidiaries.
[[alternative HTML version deleted]]
______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
<https://stat.ethz.ch/mailman/listinfo/r-help>
PLEASE do read the posting guide http://www.R-project.org/posting-
<http://www.r-project.org/posting->
guide.html
and provide commented, minimal, self-contained, reproducible code.
________________________________
The information transmitted, including any attachments, is intended only
for the person or entity to which it is addressed and may contain
confidential and/or privileged material. Any review, retransmission,
dissemination or other use of, or taking of any action in reliance upon,
this information by persons or entities other than the intended
recipient is prohibited, and all liability arising therefrom is
disclaimed. If you received this in error, please contact the sender and
delete the material from any computer. PricewaterhouseCoopers LLP is a
Delaware limited liability partnership. This communication may come from
PricewaterhouseCoopers LLP or one of its subsidiaries.