Changes in Version 0.15-1 o a bug in person.parameter() has been fixed that caused the estimation to crash in some cases o a bug in thresholds() has been fixed that caused the routine to crash Changes in Version 0.15-0 o the RaschSampler package has been merged into eRm for convenience (still available as a separate package) Changes in Version 0.14-5 o the package is now byte-compiled by default. o some statistics added to NPtest, T7 and T7a removed. o fixed a bug in plotPWmap(). o fixed the "mplot" argument in plotting routines. o fixed the split-criterion "all.r" in LRtest. o deleted all usages of data() in examples, since eRm uses "lazy data". Changes in Version 0.14-4 o when calling NPtest the RaschSampler can now be controlled more spcifically (burn_in, step, seed). o various improvements and bugfixes for LLRA related functions. o person parameter values can be extracted now for all persons using coef(). Additionally, in-/exclusion of extrapolated values (for 0 and perfect scores) can be controlled via the argument "extrapolated". o LRtest now computes standard errors (se = TRUE) by default. o plotDIF now plots 'difficulties' for all models (formerly, 'easiness' parameters were plotted for Rasch models). Changes in Version 0.14-3 o minor bug fixed in plotGOF, where on rare occasions confidence ellipses were plotted together with control lines (spotted by Peter Parker) o improved labelling in plotjointICC Changes in Version 0.14-2 o warning regarding group assignment when using median or mean split removed from MLoef o modification in NPtest to split long output lines o changed the delimiters of plotDIF confidence intervals to pch = 20 (small bullet). Changes in Version 0.14-1 o new experimental functions to calculate and plot item and test information (by Thomas Rusch) o bug fixed in the calculation of item and person Infit t and Outfit t (hint from Rainer Alexandrowicz). o eRm no longer depends on the RaschSampler package. However, it must be installed to use NPtest. o changed the delimiters of plotDIF confidence intervals to pch = 20. Changes in Version 0.14-0 o new (wrapper) function LLRA for fitting linear logistic models with relaxed assumptions including utilities for preparing data (llra.datprep), setting up (build_W) and modifying (collapse_W) design matrices, comparing llra models (anova) and plotting results (plotTR and plotGR) (by Thomas Rusch) o 'exact' version of the Martin-Loef test for binary items and arbitrary splits added as method to NPtest o in plotGOF confidence ellipses can now be drawn for subsets of items, optionally using different colours o new function plotDIF (by Kathrin Gruber): plots confidence intervals for item parameters estimated separately in subgroups, uses LR objects as input o adapted the MLoef function to work with polytomous data and more than two item groups o error checks in NPtest: (i) 0/full resposes for items meaningless for NPtest, (ii) group in method="T4" must be of type logical, (iii) specifying all items for T4 gives meaningless results. o warning regarding group assignment when using median split removed from LRtest and Waldtest o some modifications in plotPWmap: horizontal plotting, different default plotting symbols, option to change size of plotting symbols o bug in MLoef fixed (now using logs in calculating the person contributions) o eRm now depends on R >= 2.12.0 o Latin1 encoding removed o bug in plotICC (always same title) fixed Changes in Version 0.13-0 o LLTM, LRSM, and LPCM work now for repeated measurement designs with treatment groups and missing values. o Rename vignette to 'eRm'. Changes in Version 0.12-2 o new function plotPWmap to plot Bond-and-Fox style pathway maps for the data by Julian Gilbey. Since calculation of the t-statistics requires calculation of the kurtosis of the standardized residuals, according changes to itemfit.ppar, personfit.ppar, pifit.internal, print.ifit, and print.pfit. o plotPImap patched by Julian Gilbey: length of item.subset did not match the documentation, warning stars did not all appear, pre-calculated person.parameter data can be passed to the function via pp, mis-ordered items can be coloured. some minor bugs fixed. o the optimizer can be changed to optim using fitctrl<-"optim" and reset to nlm (the default) with fitctrl<-"nlm" o value of LRtest now countains the list fitobj which contains the model objects according to the subgroups specified by splitcr o MLoef no longer supports missings values Changes in Version 0.12-1 o function invalid from package gtools integrated into eRm eRm no longer depends on gtools Changes in Version 0.12-0 o for RM, RSM, and PCM: eta parameters are now diplayed as difficulty parameters print and summary methods changed accordingly o new labeling of eta parameters in RM, RSM, and PCM. they now are labeled according to the estimated parameters for items (RM), items + categories (RSM), items x categories (PCM) o function MLoef for Martin-Loef-Test added o df in personfit and itemfit corrected o the logLik functions now extract the log-likelhood and df into objects of class logLik.eRm and loglik.ppar with elements loglik and df. the corresponding print methods have been modified accordingly. o function coef.ppar to extract person parameter estimates added o option for beta parameters added to coef.eRm o in confint.eRm: default parm = "beta" o minor modifications in the help file for IC() o plotPImap: revised rug added, bug concerning item.subset fixed, minor modifications to enhance readability o minor modifications in plotjointICC: allows for main title and colors, option legpos = FALSE suppresses legends, dev.new removed, legend = FALSE produced incorrect labeling o minor modifications in plotICC: allows for main title and colors, default coloring with col = NULL instead of NA for compatibility, option legpos = FALSE suppresses legends, mplot is now FALSE if only one item is specified o plot.ppar: dev.new removed o option 'visible' in print.ifit und print.pfit to allow for avoiding overly long output and for extraction of infit and outfit values (maybe changed to a coef method later) o strwrap() for NPtest print methods to break long lines o new methods IC.default and pmat.default for enhanced error messages o lazy loading package and datafiles