version      date  description
1.0      06/12/09  The first version on CRAN
2.0      07/13/09  Various bugs fixed; R2 plot implemented
2.1      09/14/09  Implemented sparse matrix improvements
3.0      04/29/11  Various functionalities added
3.1      08/22/11  More functionalities added
3.1.1    09/18/11  Bug in medsens weights fixed; damaged PDFs fixed
3.1.2    09/19/11  Fixed wrong plots in the vignette
3.1.3    11/21/11  Import inconsistency with Matrix fixed
4.0      03/20/12  Design and multimed functions added, along with other new features
4.0.1    04/20/12  Bug in mediate.ced fixed, along with new example data 
4.1      05/31/12  multimed for parallel design; fixed typos in summary outputs
4.1.1    08/23/12  Put in p-value computation fixed
4.1.2    08/23/12  No change; version number change due to glitch in uploading to CRAN
4.2      12/18/12  multimed with multiple alternative mediators; cluster with missing data
4.2.1    02/27/13  Mixed-effects (multilevel) models via lmer supported in mediate
4.2.2    04/18/13  Bug fix for lmer; new option to plotting functions; package now depends on sandwich
4.2.3    08/25/13  Functions for testing moderated mediation and treatment-mediator interaction; function for applying mediate to multiply imputed datasets
4.2.4    09/26/13  Compatibility with new version of lme4 (1.0)
4.3      10/13/13  immediate for mediation analysis with treatment noncompliance
4.3.1    10/16/13  Fixed the compatibility issue with Windows for multicore options
4.4      12/09/13  Added option for the BCa method for bootstrap CIs in mediate
4.4.1    08/12/14  Vignette updated to the JSS paper; categorical treatment for medsens
4.4.2    08/26/14  Switched mvrnorm to rmvnorm; fixed bug in print.summary.order
4.4.3    11/22/14  Weights for multimed; Moved some packages from Depends to Imports
4.4.4    02/18/14  Direct effects for multimed; Bug fix for an error message which appears when a glmer is used with weights
4.4.5    07/18/15  Bug fix for bias-corrected bootstrap confidence intervals
4.4.6    07/09/17  Bug fix for multilevel; Bug fix for mediate-example 2
4.4.7    03/16/19  Bug fix for parallel design bootstrap
4.5.0    06/10/19  mediate_tsls for mediation analysis using instrumental variable estimator, speedglm implementation; nonparametric bootstrap using boot; update documentation