[R] Bootstrap (bootSem) causes R to crash

[John Fox]

Dear pedtroabq,

I think that it's impossible to know from the information given why R
crashes when bootSem() is called a second time after it worked the first
time (which is how I interpret the message that you reference). I don't
think that bootSem() is doing anything unusual -- it simply refits the model
to bootstrap samples and uses try() to intercept model-fitting failures on
the bootstrap replications.

Also, although it's not relevant to the problem, it's odd not to store the
object returned by bootSem() in a variable, which is perhaps what the author
of the message means by (2).

bootSem() does use a Tk progress bar, and I suppose that it's possible that
Tcl/Tk for X-Windows or X-Windows itself isn't installed, and that's the
source of the error, but I read (1) as implying that the first call to
bootSem() worked. bootSem() only uses a Tk progress var if tcltk is loaded,
but I don't believe on the Mac that this insures that the tcltk package
actually works. If this is indeed the source of the problem, I should
probably avoid the Tk progress bar under Mac OS X because of the inadequate
support out of the box for the tcltk package on that platform.

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] On Behalf Of pedroabg
> Sent: Wednesday, March 20, 2013 1:18 PM
> To: r-help at r-project.org
> Subject: Re: [R] Bootstrap (bootSem) causes R to crash
> 
> I think we didn't receive this on the list.
> 
> 
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/Bootstrap-
> bootSem-causes-R-to-crash-tp4661900p4661944.html
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