News about R package lcmm :
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The companion paper is now available on arxiv!
Proust-Lima C, Philipps V, Liquet B (2015). Estimation of Extended Mixed Models Using Latent Classes and Latent Processes: the R package lcmm, Arxiv
Changes in Version 1.7.4 (2015-12-26):
* The package uses lazydata to automatically load the datasets of the package.
* 'jlcmm' and 'mlcmm' are shortcuts for functions 'Jointlcmm' and 'multlcmm', respectively.
* Function 'gridsearch' provides an automatic grid of departures for reducing the odds of converging towards a local maximum.
* Initial values can be randomly generated from a model with 1 class (called m1 in next example) with option B=random(m1) in hlme, lcmm, multlcmm and Jointlcmm.
Changes in Version 1.7.3.0 (2015-10-23):
* Functions 'hlme', 'lcmm', 'multlcmm', 'Jointlcmm' now include a posfix option to specify parameters that should not be estimated.
* Functions 'lcmm', 'multlcmm', 'Jointlcmm' now include a partialH option to restrict the computation of the inverse of the Hessian matrix to a submatrix
* Functions 'hlme', 'lcmm', 'multlcmm', 'Jointlcmm' now allow optional vector B to be an estimated model (with G=1) to reduce calculation time of initial values.
* Bug identified and solved in calculation of subject-specific predictions in 'hlme', 'lcmm', 'multlcmm' and 'Jointlcmm' when cor is not NULL.
* Bug identified and solved in the calculation of confidence bands for individual dynamic predictions in dynpred with draws=T.
* Bug identified and solved in the calculation of the explained variance for multlcmm objects when cor is not NULL.
Changes in Version 1.7.1 & 1.7.2 (2015-02-27):
* Function plot now includes a which="fit" option to plot observed and predicted trajectories stemming from a hlme, lcmm, Jointlcmm or multlcmm object.
* Function 'predictlink' replaces deprecated function 'link.confint'
* Function 'plot' gathers deprecated functions 'plot.linkfunction', 'plot.baselinerisk', 'plot.survival', 'plot.fit' together
Changes in Version 1.7.0 (2015-02-13):
* The function 'Jointlcmm' now allows competing risks data for the survival part and is also available for non-Gaussian longitudinal data. All existing methods for Jointlcmm objects (except EPOCE and Diffepoce functions) are adapted to the new framework.
* Functions 'link.confint', 'plot.linkfunction', 'predictL' are now available for Jointlcmm objects.
* The new functions 'incidcum' and 'plot.incidcum' respectively compute and plot the cumulative incidence associated to each competing event for Jointlcmm object.
* The new function 'fitY' computes the marginal predicted values of longitudinal outcomes in their natural scale for lcmm or multlcmm objects.
* Bug identified and solved in 'dynpred' function when used with a joint model assuming proportional hazards between latent classes.
* The Makevars file now allows compilation of the package with parallel make.
Changes in Version 1.6.5 & 1.6.6 (2014-09-10):
* bug solved regarding installation problem with parallel make
Changes in Version 1.6.4 (2014-04-11):
* The new functions 'dynpred' and 'plot.dynpred' respectively compute and plot individual dynamic predictions obtained from a joint latent class model estimated by Jointlcmm.
* The new function 'VarCovRE' computes the standard errors of the parameters of variance-covariance of the random effects for a hlme, lcmm, Jointlcmm or multlcmm object
* The new function 'WaldMult' computes multivariate Wald tests and Wald tests for combinations of parameters from hlme, lcmm, Jointlcmm or multlcmm object
* The new function 'VarExpl' computes the percentages of variance explained by the linear regression for a hlme, lcmm, Jointlclmm or multlcmm object
* The new functions 'estimates' and 'VarCov' get respectively all parameters estimated and their variance-covariance matrix for a hlme, lcmm, Jointlcmm or multlcmm object
* Function 'summary' now returns the table containing the results about the fixed effects in the longitudinal model
* All plots consider now the ... options
* Functions plot.linkfunction and plot.predict have now an add argument
* Function multlcmm now allows "splines" or "Splines" specification for the link functions
* Functions 'lcmm' and 'multlcmm' now compute the transformations even if the maximum number of iterations is reached without convergence
* bug identified and solved in multlcmm when the response variables are not integers
* bug identified and solved in multlcmm when using contrast
* bug identified and solved in plot.linkfunction for the y axes positions
* bug identified and solved in hlme, lcmm, Jointlcmm and multlcmm when including interactions in 'mixture'.
Changes in Version 1.6.2 (2013-03-06):
* The new function 'multlcmm' now estimates latent process mixed models for multivariate curvilinear longitudinal outcomes (with link functions: linear, beta or splines). Various post-fit computation and output functions are also available including plot.linkfunction, predictY, predictL, etc
* All the functions hlme, lcmm, Jointlcmm include a 'cor' option for including a brownian motion or a first-order autoregressive error process in addition to the independent errors of measurement
* bug identified and solved in predictL, predictY and plot.predict when used with factor covariate
Changes in Version 1.5.8 (2012-10-01):
* bug identified and solved in predictY.lcmm when used with a 'splines' link function and an outcome with minimum value not at 0
Changes in Version 1.5.7 (2012-07-24):
* The function 'predictY' now computes the predicted values (possibly class-specific) of the longitudinal outcome not only from a lcmm object but also from a hlme or a Jointlcmm object for a specified profile of covariates.
* bug identified and solved in predictY.lcmm when used with a 'threshold' link function and a Monte Carlo method
Changes in Version 1.5.6 (2012-07-16):
* missing data handled in hlme, lcmm and Jointlcmm using 'na.action' with attributes 1 for 'na.omit' or 2 for 'na.fail'
* The new function 'predictY.lcmm' computes predicted values of a lcmm object in the natural outcome scale for a specified profile of covariates, and also provides confidence bands using a Monte Carlo method.
* bugs in epoce computation solved (with splines baseline risk function, and/or NaN values under solaris system)
* bug identified and solved in summary functions regarding the labels of covariate effects in peculiar cases
Changes in Version 1.5.2 (2012-04-06):
* improved variable specification in the estimating functions Jointlcmm, lcmm and hlme with
- categorical variables using factor()
- variables entered as functions using I()
- interaction terms using "*" and ":"
* computation of the predictive accuracy measure EPOCE from a Jointlcmm object either on the training data or on external data (post-fit functions epoce and Diffepoce)
* for discrete outcomes, lcmm function now computates the posterior discrete log-likelihood and the universal approximate cross-validation criterion (UACV)
* Jointlcmm now includes two parameterizations of I-splines and piecewise-constant baseline risks functions to ensure positive risks: either log/exp or sqrt/square (option logscale=).