\begin{thebibliography}{}

\bibitem [\protect \citeauthoryear {%
Almond%
, Deane%
, Quinlan%
, Wagner%
\BCBL {}\ \BBA {} Sydorenko%
}{%
Almond%
\ \protect \BOthers {.}}{%
{\protect \APACyear {2012}}%
}]{%
KeystrokeRR}
\APACinsertmetastar {%
KeystrokeRR}%
\begin{APACrefauthors}%
Almond, R\BPBI G.%
, Deane, P.%
, Quinlan, T.%
, Wagner, M.%
\BCBL {}\ \BBA {} Sydorenko, T.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2012}{}{}.
\newblock
\APACrefbtitle {A Preliminary Analysis of Keystroke Log Data from a Timed
  Writing Task} {A preliminary analysis of keystroke log data from a timed
  writing task}\ \APACbVolEdTR {}{Research Report\ \BNUM\ RR-12-23}.
\newblock
\APACaddressInstitution{}{Educational Testing Service}.
\newblock
\begin{APACrefURL}
  \url{http://www.ets.org/research/policy_research_reports/publications/report/2012/jgdg}
  \end{APACrefURL}
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\bibitem [\protect \citeauthoryear {%
Benaglia%
, Chauveau%
, Hunter%
\BCBL {}\ \BBA {} Young%
}{%
Benaglia%
\ \protect \BOthers {.}}{%
{\protect \APACyear {2009}}%
}]{%
mixtools}
\APACinsertmetastar {%
mixtools}%
\begin{APACrefauthors}%
Benaglia, T.%
, Chauveau, D.%
, Hunter, D\BPBI R.%
\BCBL {}\ \BBA {} Young, D.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2009}{}{}.
\newblock
{\BBOQ}\APACrefatitle {{mixtools}: An {R} Package for Analyzing Finite Mixture
  Models} {{mixtools}: An {R} package for analyzing finite mixture
  models}.{\BBCQ}
\newblock
\APACjournalVolNumPages{Journal of Statistical Software}{32}{6}{1--29}.
\newblock
\begin{APACrefURL} \url{http://www.jstatsoft.org/v32/i06/} \end{APACrefURL}
\PrintBackRefs{\CurrentBib}

\bibitem [\protect \citeauthoryear {%
Brooks%
, Gelman%
, Jones%
\BCBL {}\ \BBA {} Meng%
}{%
Brooks%
\ \protect \BOthers {.}}{%
{\protect \APACyear {2011}}%
}]{%
MCMCHandbook}
\APACinsertmetastar {%
MCMCHandbook}%
\begin{APACrefauthors}%
Brooks, S.%
, Gelman, A.%
, Jones, G\BPBI L.%
\BCBL {}\ \BBA {} Meng, X.%
\end{APACrefauthors}%
\ (\BEDS).
\unskip\
\newblock
\APACrefYear{2011}.
\newblock
\APACrefbtitle {Handbook of Markov Chain Monte Carlo} {Handbook of markov chain
  monte carlo}.
\newblock
\APACaddressPublisher{}{CRC Press}.
\PrintBackRefs{\CurrentBib}

\bibitem [\protect \citeauthoryear {%
Deane%
}{%
Deane%
}{%
{\protect \APACyear {2012}}%
}]{%
Deane2012}
\APACinsertmetastar {%
Deane2012}%
\begin{APACrefauthors}%
Deane, P.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2012}{}{}.
\newblock
{\BBOQ}\APACrefatitle {Rethinking {K-12} Writing assessment} {Rethinking {K-12}
  writing assessment}.{\BBCQ}
\newblock
\BIn{} N.~Elliot\ \BBA {} L.~Perelman\ (\BEDS), \APACrefbtitle {Writing
  assessment in the 21st century. Essays in honor of {Edward} {M.} White}
  {Writing assessment in the 21st century. essays in honor of {Edward} {M.}
  white}\ (\BPGS\ 87--100).
\newblock
\APACaddressPublisher{}{Hampton Press}.
\PrintBackRefs{\CurrentBib}

\bibitem [\protect \citeauthoryear {%
Fr\"uthwirth-Schnatter%
}{%
Fr\"uthwirth-Schnatter%
}{%
{\protect \APACyear {2001}}%
}]{%
Fruthwirth2001}
\APACinsertmetastar {%
Fruthwirth2001}%
\begin{APACrefauthors}%
Fr\"uthwirth-Schnatter, S.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2001}{}{}.
\newblock
{\BBOQ}\APACrefatitle {{Markov} Chain {Monte} {Carlo} Estimation of Classical
  and Dynamic Switching and Mixture Models.} {{Markov} chain {Monte} {Carlo}
  estimation of classical and dynamic switching and mixture models.}{\BBCQ}
\newblock
\APACjournalVolNumPages{Journal of the American Statistical
  Association}{96}{453}{194--209}.
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\bibitem [\protect \citeauthoryear {%
Gelman%
\ \protect \BOthers {.}}{%
Gelman%
\ \protect \BOthers {.}}{%
{\protect \APACyear {2013}}%
}]{%
BDA3}
\APACinsertmetastar {%
BDA3}%
\begin{APACrefauthors}%
Gelman, A.%
, Carlin, J\BPBI B.%
, Stern, H\BPBI S.%
, Dunson, D\BPBI B.%
, Vehtari, A.%
\BCBL {}\ \BBA {} Rubin, D\BPBI B.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYear{2013}.
\newblock
\APACrefbtitle {{Bayesian} data analysis} {{Bayesian} data analysis}\
  (\PrintOrdinal{3rd}\ \BEd).
\newblock
\APACaddressPublisher{}{Chapman and Hall}.
\newblock
\APACrefnote{The third edition is revised and expanded and has material that
  the earlier editions lack.}
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\bibitem [\protect \citeauthoryear {%
Gelman%
\ \BBA {} Shirley%
}{%
Gelman%
\ \BBA {} Shirley%
}{%
{\protect \APACyear {2011}}%
}]{%
GelmanShirley2011}
\APACinsertmetastar {%
GelmanShirley2011}%
\begin{APACrefauthors}%
Gelman, A.%
\BCBT {}\ \BBA {} Shirley, K.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2011}{}{}.
\newblock
{\BBOQ}\APACrefatitle {Inference from Simulations and Monitoring Convergence}
  {Inference from simulations and monitoring convergence}.{\BBCQ}
\newblock
\BIn{} S.~Brooks, A.~Gelman, G\BPBI L.~Jones\BCBL {}\ \BBA {} X.~Meng\ (\BEDS),
  \APACrefbtitle {Handbook of Markov Chain Monte Carlo} {Handbook of markov
  chain monte carlo}\ (\BPGS\ 163--174).
\newblock
\APACaddressPublisher{}{CRC Press}.
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\bibitem [\protect \citeauthoryear {%
Geyer%
}{%
Geyer%
}{%
{\protect \APACyear {2011}}%
}]{%
Geyer2011}
\APACinsertmetastar {%
Geyer2011}%
\begin{APACrefauthors}%
Geyer, C\BPBI J.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2011}{}{}.
\newblock
{\BBOQ}\APACrefatitle {Introduction to {Markov} Chain {Monte} {Carlo}}
  {Introduction to {Markov} chain {Monte} {Carlo}}.{\BBCQ}
\newblock
\BIn{} S.~Brooks, A.~Gelman, G\BPBI L.~Jones\BCBL {}\ \BBA {} X.~Meng\ (\BEDS),
  \APACrefbtitle {Handbook of Markov Chain Monte Carlo} {Handbook of markov
  chain monte carlo}\ (\BPGS\ 3--48).
\newblock
\APACaddressPublisher{}{CRC Press}.
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\bibitem [\protect \citeauthoryear {%
Gruen%
\ \BBA {} Leisch%
}{%
Gruen%
\ \BBA {} Leisch%
}{%
{\protect \APACyear {2008}}%
}]{%
flexmix}
\APACinsertmetastar {%
flexmix}%
\begin{APACrefauthors}%
Gruen, B.%
\BCBT {}\ \BBA {} Leisch, F.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2008}{}{}.
\newblock
{\BBOQ}\APACrefatitle {{FlexMix} Version 2: Finite mixtures with concomitant
  variables and varying and constant parameters} {{FlexMix} version 2: Finite
  mixtures with concomitant variables and varying and constant
  parameters}.{\BBCQ}
\newblock
\APACjournalVolNumPages{Journal of Statistical Software}{28}{4}{1--35}.
\newblock
\begin{APACrefURL} \url{http://www.jstatsoft.org/v28/i04/} \end{APACrefURL}
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\bibitem [\protect \citeauthoryear {%
Li%
}{%
Li%
}{%
{\protect \APACyear {2013}}%
}]{%
Li2013}
\APACinsertmetastar {%
Li2013}%
\begin{APACrefauthors}%
Li, T.%
\end{APACrefauthors}%
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\newblock
\APACrefYear{2013}.
\unskip\
\newblock
\APACrefbtitle {A {Bayesian} Hierarchical Mixture Approach to Model Timing Data
  with Application to Writing Assessment} {A {Bayesian} hierarchical mixture
  approach to model timing data with application to writing assessment}\
  \APACtypeAddressSchool {\BUMTh}{}{}.
\unskip\
\newblock
\APACaddressSchool {}{Florida State University}.
\PrintBackRefs{\CurrentBib}

\bibitem [\protect \citeauthoryear {%
McLachlan%
\ \BBA {} Krishnan%
}{%
McLachlan%
\ \BBA {} Krishnan%
}{%
{\protect \APACyear {2008}}%
}]{%
mclachlan2008EM}
\APACinsertmetastar {%
mclachlan2008EM}%
\begin{APACrefauthors}%
McLachlan, G.%
\BCBT {}\ \BBA {} Krishnan, T.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYear{2008}.
\newblock
\APACrefbtitle {The {EM} algorithm and extensions} {The {EM} algorithm and
  extensions}\ (\PrintOrdinal{2nd}\ \BEd).
\newblock
\APACaddressPublisher{}{Wiley}.
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\bibitem [\protect \citeauthoryear {%
McLachlan%
\ \BBA {} Peel%
}{%
McLachlan%
\ \BBA {} Peel%
}{%
{\protect \APACyear {2000}}%
}]{%
McLachlanPeel2000}
\APACinsertmetastar {%
McLachlanPeel2000}%
\begin{APACrefauthors}%
McLachlan, G.%
\BCBT {}\ \BBA {} Peel, D.%
\end{APACrefauthors}%
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\newblock
\APACrefYear{2000}.
\newblock
\APACrefbtitle {Finite Mixture Models} {Finite mixture models}.
\newblock
\APACaddressPublisher{}{Wiley}.
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\bibitem [\protect \citeauthoryear {%
Mislevy%
, Almond%
, Yan%
\BCBL {}\ \BBA {} Steinberg%
}{%
Mislevy%
\ \protect \BOthers {.}}{%
{\protect \APACyear {1999}}%
}]{%
WhereNumbers}
\APACinsertmetastar {%
WhereNumbers}%
\begin{APACrefauthors}%
Mislevy, R\BPBI J.%
, Almond, R\BPBI G.%
, Yan, D.%
\BCBL {}\ \BBA {} Steinberg, L\BPBI S.%
\end{APACrefauthors}%
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\newblock
\APACrefYearMonthDay{1999}{}{}.
\newblock
{\BBOQ}\APACrefatitle {Bayes nets in educational assessment: Where the numbers
  come from.} {Bayes nets in educational assessment: Where the numbers come
  from.}{\BBCQ}
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\BIn{} K\BPBI B.~Laskey\ \BBA {} H.~Prade\ (\BEDS), \APACrefbtitle {Uncertainty
  in Artificial Intelligence '99} {Uncertainty in artificial intelligence '99}\
  (\BPG~437-446).
\newblock
\APACaddressPublisher{}{Morgan-Kaufmann}.
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\bibitem [\protect \citeauthoryear {%
Neal%
}{%
Neal%
}{%
{\protect \APACyear {2011}}%
}]{%
Neal2011}
\APACinsertmetastar {%
Neal2011}%
\begin{APACrefauthors}%
Neal, R\BPBI M.%
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\newblock
\APACrefYearMonthDay{2011}{}{}.
\newblock
{\BBOQ}\APACrefatitle {{MCMC} Using {Hamiltonian} Dynamics} {{MCMC} using
  {Hamiltonian} dynamics}.{\BBCQ}
\newblock
\BIn{} MCMCHandbook\ (\BED), (\BPGS\ 113--162).
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\bibitem [\protect \citeauthoryear {%
Plummer%
}{%
Plummer%
}{%
{\protect \APACyear {2012}}%
}]{%
JAGS}
\APACinsertmetastar {%
JAGS}%
\begin{APACrefauthors}%
Plummer, M.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2012}{May}{}.
\newblock
{\BBOQ}\APACrefatitle {{JAGS} Version 3.2.0 User Manual} {{JAGS} version 3.2.0
  user manual}{\BBCQ}\ (\PrintOrdinal{3.2.0}\ \BEd)\
  [\bibcomputersoftwaremanual].
\newblock
\begin{APACrefURL} \url{http://mcmc-jags.sourceforge.net/} \end{APACrefURL}
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\bibitem [\protect \citeauthoryear {%
Plummer%
, Best%
, Cowles%
\BCBL {}\ \BBA {} Vines%
}{%
Plummer%
\ \protect \BOthers {.}}{%
{\protect \APACyear {2006}}%
}]{%
coda}
\APACinsertmetastar {%
coda}%
\begin{APACrefauthors}%
Plummer, M.%
, Best, N.%
, Cowles, K.%
\BCBL {}\ \BBA {} Vines, K.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2006}{}{}.
\newblock
{\BBOQ}\APACrefatitle {CODA: Convergence Diagnosis and Output Analysis for
  MCMC} {Coda: Convergence diagnosis and output analysis for mcmc}.{\BBCQ}
\newblock
\APACjournalVolNumPages{R News}{6}{1}{7--11}.
\newblock
\begin{APACrefURL} \url{http://CRAN.R-project.org/doc/Rnews/} \end{APACrefURL}
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\bibitem [\protect \citeauthoryear {%
{R Core Team}%
}{%
{R Core Team}%
}{%
{\protect \APACyear {2014}}%
}]{%
R}
\APACinsertmetastar {%
R}%
\begin{APACrefauthors}%
{R Core Team}.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2014}{}{}.
\newblock
{\BBOQ}\APACrefatitle {R: A Language and Environment for Statistical Computing}
  {R: A language and environment for statistical computing}{\BBCQ}\
  [\bibcomputersoftwaremanual].
\newblock
\APACaddressPublisher{Vienna, Austria}{}.
\newblock
\begin{APACrefURL} \url{http://www.R-project.org/} \end{APACrefURL}
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\bibitem [\protect \citeauthoryear {%
{Stan Development Team}%
}{%
{Stan Development Team}%
}{%
{\protect \APACyear {2013}}%
}]{%
stan}
\APACinsertmetastar {%
stan}%
\begin{APACrefauthors}%
{Stan Development Team}.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2013}{}{}.
\newblock
{\BBOQ}\APACrefatitle {Stan: A {C++} Library for Probability and Sampling}
  {Stan: A {C++} library for probability and sampling}{\BBCQ}\
  (\PrintOrdinal{Version 2.2.0}\ \BEd)\ [\bibcomputersoftwaremanual].
\newblock
\begin{APACrefURL} \url{http://mc-stan.org/} \end{APACrefURL}
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\bibitem [\protect \citeauthoryear {%
Thomas%
, O'Hara%
, Ligges%
\BCBL {}\ \BBA {} Sturtz%
}{%
Thomas%
\ \protect \BOthers {.}}{%
{\protect \APACyear {2006}}%
}]{%
OpenBUGSAnnounce}
\APACinsertmetastar {%
OpenBUGSAnnounce}%
\begin{APACrefauthors}%
Thomas, A.%
, O'Hara, B.%
, Ligges, U.%
\BCBL {}\ \BBA {} Sturtz, S.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2006}{}{}.
\newblock
{\BBOQ}\APACrefatitle {Making {BUGS} Open} {Making {BUGS} open}.{\BBCQ}
\newblock
\APACjournalVolNumPages{{R} News}{6}{}{12-17}.
\newblock
\begin{APACrefURL}
  \url{http://www.rni.helsinki.fi/~boh/publications/Rnews2006-1.pdf}
  \end{APACrefURL}
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\bibitem [\protect \citeauthoryear {%
Thomas%
, Spiegelhalter%
\BCBL {}\ \BBA {} Gilks%
}{%
Thomas%
\ \protect \BOthers {.}}{%
{\protect \APACyear {1992}}%
}]{%
BUGSCite}
\APACinsertmetastar {%
BUGSCite}%
\begin{APACrefauthors}%
Thomas, A.%
, Spiegelhalter, D\BPBI J.%
\BCBL {}\ \BBA {} Gilks, W\BPBI R.%
\end{APACrefauthors}%
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\newblock
\APACrefYearMonthDay{1992}{}{}.
\newblock
{\BBOQ}\APACrefatitle {{BUGS}: A program to perform {Bayesian} inference using
  {Gibbs} sampling} {{BUGS}: A program to perform {Bayesian} inference using
  {Gibbs} sampling}.{\BBCQ}
\newblock
\BIn{} J\BPBI M.~Bernardo, J\BPBI O.~Berger, A\BPBI P.~Dawid\BCBL {}\ \BBA {}
  A\BPBI F\BPBI M.~Smith\ (\BEDS), \APACrefbtitle {{Bayesian} Statistics 4.\/}
  {{Bayesian} statistics 4.\/}\ (\BPGS\ 837--842).
\newblock
\APACaddressPublisher{}{Clarendon Press}.
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\end{thebibliography}
