On Thursday 23 July 2009, meik michalke wrote: > i have installed R version 2.9.1, eRm version 0.10-2 and ltm version 0.9-1. > what does your output look like?
I get:
Call:
tpm(data = LSAT)
Coefficients:
Gussng Dffclt Dscrmn
Item 1 0.064 -3.342 0.805
Item 2 0.016 -1.553 0.607
Item 3 0.301 0.330 26.415
Item 4 0.065 -2.034 0.570
Item 5 0.029 -3.583 0.552
Log.Lik: -2468.51
Warning message:
In tpm(data = LSAT) :
Hessian matrix at convergence is not positive definite; unstable solution.
This is after upgrading to R 2.9.1, and updating all installed R packages to
the latest available version (but was no different with R 2.9.0 and older
versions of some packages). Same output when running in a plain R session.
Interestingly, on the same machine, dual-booted into windows, I get your
results. I admit, that does look like something strange is going on on my
system. No idea, what may be the cause. I suggest you commit your version of
the test standard for now, and I'll try to find out what may be the issue on my
computer, later.
> however, i've re-run the tests several times, of course, and i always get
> the exact same results to the last digit. do your results only differ
> slightly from mine, or from run to run as well? i'd suspect the first and
> hold floating point accuracy of different cpus accountable, or something
> like that.
It looks like you're right, but I've only tried two or three times so far.
Regards
Thomas
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