[R] R-2.14.0: read.csv2 with fileEncoding="UTF-8"

2011-11-24 Thread Christian Montel
Dear R-List, I'm trying to read an UTF-8-encoded text file which works fine under # ### CONFIG 1 > sessionInfo() R version 2.12.1 (2010-12-16) Platform: i386-pc-mingw32/i386 (32-bit) locale: [1] LC_COLLATE=German_Germany.1252 L

[R] ltm: Simplified approach to bootstrapping 2PL-Models?

2011-11-20 Thread Christian Montel
l in question. Any comments which may help me figure out whether I'm on the right track are greatly appreciated. Thank you in advance, best regards, Christian Dr. Christian Montel E-Mail: christian.mon...@eligo.de eligo GmbH -- Büro Berlin Tel.: +49

[R] ltm: Simplified approach to bootstrapping 2PL-Models?

2011-11-20 Thread Christian Montel
Dear R-List, to assess the model fit for 2PL-models, I tried to mimic the bootstrap-approach chosen in the GoF.rasch()-function. Not being a statistician, I was wondering whether the following simplification (omit the "chi-squared-expressed model fit-step") would be appropriate: GoF.ltm <- funct