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listman
2010 Mar 10
2
help R non-parametric IRT simulation
Hello R,
I am looking for non-parametric simulation in IRT. Is there any IRT
package that does non-parametric simulation?
helen L
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2007 Sep 21
1
Is it solve.QP or is it me?
...e-18 1.666667e-01 3.703906e-18
1.666667e-01
[12] 2.220988e-17
The problem, of course, is rounding error. A small jitter in the
constraints takes care of it:
>(bvan<-c(bva[1:11],-0.0000000001))
[1] 1e+00 1e+00 -1e+00 0e+00 -1e+00 0e+00 -1e+00 0e+00 -1e+00 0e+00
-1e+00 -1e-10
>liSMan<-solve.QP(cma,dva,Ama,bvan,meq)
>liSMan$solution
[1] 2.000000e-01 0.000000e+00 2.000000e-01 8.002963e-53 2.000000e-01
0.000000e+00 2.000000e-01 0.000000e+00 2.000000e-01 -1.664250e-17
>
When I was testing, I ran into the bad case right away, and it knocked me
for a loop, beca...
2010 Mar 03
1
help R IRT simulation
hello R,
This is about simulation in psychomtrics in IRT in R. I want to simulate b
parameters(item difficulty) with moments of fixed values of mean, st.d,
skewness and kurtosis. Is there any specific IRT package in R with those
functions to control those moments? I have seen other programs that can
control mean and st.d but not skewness and kurtosis.
Thank you,
helen L
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