R help - Aug 2016 - Problem detect cheating with CopyDetect Package

Dear All list members,
Please Help me
I have the problem detect cheating analysis with use of CopyDetect Package
I use my own data
namely data.abcd and slopintrc
and when I tried to count by R studio with a script

for (i in 1: replication) {

   x <- CopyDetect2 (data = data.abcd,
                    item.par = slopintrc,
                    pair = c (pairs [i, 1], pairs [i, 2]),
                    options = c ("A", "B", "C",
"D", "E"))

   pairs [i,] $ W = x $ W.index $ p.value
   pairs [i,] $ GBT = x $ GBT.index $ p.value
   pairs [i,] $ K = x $ K.index $ k.index
   pairs [i,] $ K1 = x $ K.variants $ K1.index
   pairs [i,] $ K2 = x $ K.variants $ K2.index
   pairs [i,] $ S1 = x $ K.variants $ S1.index
   pairs [i,] $ S2 = x $ K.variants $ S2.index
}

an error

Error in solve.default(object$hessian) :
  system is computationally singular: reciprocal condition number 2.52915e-29In
addition: Warning message:In ltm.fit(X, betas,
constraint, formula, con) :
  Hessian matrix at convergence is not positive definite; unstable solution.

Please help me
--

	[[alternative HTML version deleted]]

If we R users unfamiliar with the details of the CopyDetect package are to be
able to help,  we would need a reproducible example that includes data. See to
http://www.catb.org/esr/faqs/smart-questions.html and
http://adv-r.had.co.nz/Reproducibility.html for discussion on how to ask for
help online.

I will make a wild guess that your data is nowhere near as broadly variable as
this algorithm needs in order to work... but it might just be incorrect
specification of parameters. Either way you have hidden the answers from us. If
you think the package is broken or you need help with the theory you should
identify the maintainer with the maintainer() function and correspond with them.

-- 
Sent from my phone. Please excuse my brevity.

On August 16, 2016 7:13:41 PM PDT, Ahmad Nursalim <ceritaahmad at
gmail.com> wrote:
>Dear All list members,
>Please Help me
>I have the problem detect cheating analysis with use of CopyDetect
>Package
>I use my own data
>namely data.abcd and slopintrc
>and when I tried to count by R studio with a script
>
>for (i in 1: replication) {
>
>   x <- CopyDetect2 (data = data.abcd,
>                    item.par = slopintrc,
>                    pair = c (pairs [i, 1], pairs [i, 2]),
>                    options = c ("A", "B",
"C", "D", "E"))
>
>   pairs [i,] $ W = x $ W.index $ p.value
>   pairs [i,] $ GBT = x $ GBT.index $ p.value
>   pairs [i,] $ K = x $ K.index $ k.index
>   pairs [i,] $ K1 = x $ K.variants $ K1.index
>   pairs [i,] $ K2 = x $ K.variants $ K2.index
>   pairs [i,] $ S1 = x $ K.variants $ S1.index
>   pairs [i,] $ S2 = x $ K.variants $ S2.index
>}
>
>an error
>
>Error in solve.default(object$hessian) :
>  system is computationally singular: reciprocal condition number
>2.52915e-29In addition: Warning message:In ltm.fit(X, betas,
>constraint, formula, con) :
>Hessian matrix at convergence is not positive definite; unstable
>solution.
>
>Please help me
>--
>
>	[[alternative HTML version deleted]]
>
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