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12 results for “from:Federico Andreis”

Multilevel IRT Modelling
Federico Andreis · Jul 15, 2010 · r-help

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exponent function help??
Federico Andreis · Jul 13, 2011 · r-help

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Exporting NMDS distance matris to csv
Federico Andreis · Jul 20, 2010 · r-help

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Syntax Highlightning and Editor for Linux
Federico Andreis · Jul 23, 2010 · r-help

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Want to exclude a column when using sample function
Federico Andreis · Jul 14, 2010 · r-help

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How to generate a smoothed surface for a three dimensional dataset?
Federico Andreis · Dec 4, 2013 · r-help

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Multilevel IRT Modelling
Dr. Federico Andreis · Jul 14, 2010 · r-help

Dear All, does anybody know of a package (working under Linux) for multilevel IRT modelling? I'd love to do this without having to go on WINSTEPS or the like.. thanks for the attention! Federico Andreis ----- Dr. Federico Andreis Universit...

[Rcpp-devel] Integrals with Rcpp
Federico Andreis · Jan 9, 2015 · rcpp-devel

Dear all, I was wondering what, in your opinion, would be the best way to handle the computation of definite integrals using Rcpp. To be more precise, I need to evaluate a double integral that turns out to be somewhat...

Likelihood Optimization With Categorical Variables
Dr. Federico Andreis · Mar 12, 2010 · r-help

Dear all, I have the following problem: I have been using the routine "optim" in order to maximize a joint likelihood (basically a mixture with modeled weights) with quantitative variables..so far so good. Now I need to plug into...

DIF Analysis starting from a gpcm class object
Dr. Federico Andreis · Jul 21, 2010 · r-help

Dear useRs, does any of you have suggestions on how to conduct a proper DIF analysis starting from a model of class gpcm (from the wonderful package ltm by prof. Rizopoulos)? difR will handle only dichotomous items, and I have...

[Rcpp-devel] Integrals with Rcpp
Federico Andreis · Jan 14, 2015 · rcpp-devel

Thanks a lot, Baptiste! I'll check your code asap. Cheers, /f On Tue, Jan 13, 2015 at 7:14 PM, Baptiste Auguie <baptiste.auguie at gmail.com> wrote: > Hi, > > I might be the author of the SO question you...

[Rcpp-devel] Integrals with Rcpp
Federico Andreis · Jan 9, 2015 · rcpp-devel

Dear Dirk, thanks for your answer, I'll keep studying and decide what way to follow. Dear Qiang, here's the code for the function (I already did some work to the math behind the density itself in order to...

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