------------------------------ CDM NEWS ------------------------------------

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CDM package
A. Robitzsch, T. Kiefer, A. C. George & A. Uenlue


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CDM 1.3 (2013-04-14)
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x included the general diagnostic model (function gdm)
x included a function for calculating equivalent skill classes
  for the DINA/DINO model
x modelfit and anova functions are also accessible for the GDM
x fixed a bug in the function for classification accuracy
x included the RMSEA item fit index
x fixed a bug in gdina estimation
x included coef extractor function

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CDM 1.2-3 (2013-02-12)
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x included a model fit function modelfit.cor(.din) for the
  comparison of observed and expected correlations
x fixed a bug in the gdina function when applying the model
  with one skill

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CDM 1.2-1/1.2-2 (2013-02-01)
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x allow for user specified reduced skill space designs
x included tetrachoric correlations in summary.gdina function
x handled zero probability classes in gdina function
x allowed for output and input of attribute patterns in sim.din
  function
x included relative deviance change as convergence criterion in din
  function
x included function for determining a statistically equivalent 
  DINA model (von Davier, 2013)
x changed structure of din summary
x included an anova function
x included a function for estimating classification reliability
x fixed a bug in gdina function when creating design matrices

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CDM 1.2.0 (2012-09-30)
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 x implemented the latent skill space reduction according
   to Xu and von Davier (2008)
 x fixed a bug in calculation of estimated parameters
 x fixed a bug in IDI calculation
 x corrected MLE based classification in case of latent
   classes with a priori spceified zero probability in the
   din function (yet to be done in gdina)
 x fixed a bug in standard error calculation in gdina
 x speed improvements in din and gdina function
   - included a C function for calculating the posterior 
     distribution
 x check of admissible rule in gdina
 x include rule "GDINA2" and "GDINA1" ("GDINA1" is 
   equivalent to "ACDM")
 x Simulation function for the GDINA model included
 x multiple group gdina function for estimation of
   generalized DINA models (de la Torre, 2011)
 x new function summary.gdina

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CDM 1.1 (2012-07-29)
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 x highest argument deleted from print.din method
 x new argument for summary.din n.skill.classes
 x skill pattern probabilities deleted from print.din
 x skill pattern summary replaced by n most frequent skill 
   classes in summary.din
 x (argument ask=TRUE in summary.din placed by overwrite=FALSE)
 x use a different item discrimination index (Lee et al., 2012)
 x remove GDINA estimation from this package version because
   it is in an experimental status 
     -> gdina will be included in CDM >= 1.1-1
 x new optional attribute for q-matrix specification list of skill 
   labels
 x changed ouput in din function
    -> pattern, like and posterior are sorted according to the original 
       input data frame
 x remove a bug for models with only attribute
 x new argument for din method zeroprob.skillclasses
 x new argument for din method equal.itempars
 x new arguments for summary.din method log.file and ask
 x minor bug fixes in print.din method
 x replace internal method rowProds with faster rowProds2
 x option for writing an output file of model results included in 
   function summary.din