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sim.LDT.data.R: change L to be optional input with default as .Machine$double.xmax, which is the largest double value of R

LDT.estimator.R: change L to be optional input with default as .Machine$double.xmax, which is the largest double value of R

LDT.estimator.R: add a covariance estimate COV12 between SURV1 and SURV2 in the returned value

LDT.estimator.R: change the returned value as a data frame

LDT.mean.estimator.R: change L to be optional input with default as .Machine$double.xmax, which is the largest double value of R

LDT.mean.estimator.R: add a covariance estimate MCOV12 between MEAN1 and MEAN2 in the returned value

LDT.mean.estimator.R: change the returned value as a data frame

New function sim.WRSE.data.R added to simulate data from sequentially randomized clinical trials (Guo and Tsiatis 2005)

New function WRSE.estimator.R added to calculate WRSE estimator (Guo and Tsiatis 2005)

New function DTR.Wald.test.R added to compare dynamic treatment regimes (DTRs) using Wald-type tests

New function DTR.surv.plot.R added to plot survival curves for dynamic treatment regimes (DTRs)

New function sim.Cox.data.R added to simulate data from sequentially randomized clinical trials (Tang and Wahed 2011)

New function DTR.Cox.test.R added to compare dynamic treatment regimes (DTRs) after adjustment for covariates (Tang and Wahed 2011)

New function sim.CHR.data.R added to simulate data from sequentially randomized clinical trials (Tang and Wahed 2013 [Epub ahead of print])

New function updateBeta.R added to update the coefficient estimate(s) for covariate(s)

New function CHR.estimator.R added to calculating cumulative hazard ratio (CHR) estimator (Tang and Wahed 2013 [Epub ahead of print])

New function CHR.Wald.test.R added to compare dynamic treatment regimes (DTRs) based on cumulative hazard ratios (CHRs) (Tang and Wahed 2013 [Epub ahead of print])

New function DTR.CHR.plot.R added to plot (log) cumulative hazard ratio between different dynamic treatment regimes (DTRs)

New function sim.Logrank.data.R added to simulate data from sequentially randomized clinical trials (Kidwell and Wahed 2013)

New function DTR.Logrank.test.R added to compare dynamic treatment regimes (DTRs) using weighted logrank tests

The function sim.LDT.data was renamed to simLDTdata

The function LDT.estimator.R was replaced by the function LDTestimate.R

The function LDTestimate.R returns an object of class DTR containing all the survival estimates and estimated standard errors at observed event times

The function LDT.mean.estimator.R was deleted

The function sim.WRSE.data was renamed to simWRSEdata

The function WRSE.estimator.R was replaced by the function WRSEestimate.R

The function WRSEestimate.R returns an object of class DTR containing all the survival estimates and estimated standard errors at observed event times

The S3 functions print.DTR, summary.DTR, print.summary.DTR, and plot.DTR were added

The function DTR.Wald.test.R was replaced by the function contrast.wald.R

The function contrast.wald.R implements the function wald.test() from the package aod to perform wald-type tests

The function sim.CHR.data was renamed to simCHRdata

The function CHR.estimator.R was replaced by the function CHRestimate.R

The function CHRestimate.R returns an object of class CHR containing all the cumulative hazard ratio estimates and estimated standard errors at observed event times

The S3 functions print.CHR, summary.CHR, print.summary.CHR, and plot.CHR were added

The function CHR.Wald.test.R was replaced by the function contrast.chr.R

The function contrast.chr.R implements the function wald.test() from the package aod to perform wald-type tests using the CHR estimates and their variance/covariance estimates

The function sim.Cox.data was renamed to simPHdata

The function DTR.Cox.test was replaced by two separate functions PHfit.R and contrast.ph.R

The function PHfit.R returns an object of class coxph containing the proportional hazard model fit

The function contrast.ph.R implements the function wald.test() from the package aod to perform wald-type tests based on the returned coefficient and variance/covariance estimated from PHfit()

The function sim.Logrank.data.R was renamed to simLRdata

The function DTR.Logrank.test.R was replaced by the function contrast.logrank.R

The data sets LDTdata, WRSEdata, CHRdata, PHdata, and LRdata were added to data folder

datalist was added to data folder

The function contrast.wald was renamed to contrast_wald

The function contrast.chr was renamed to contrast_chr

The function contrast.logrank was renamed to contrast_logrank

The function contrast.ph was renamed to contrast_ph

An input option covar was added to the function PHfit to allow user to specify the covariates to be adjusted

An input option covar was added to the function CHRestimate to allow user to specify the covariates to be adjusted

An input option censored was added to the function plot.DTR for plotting censoring ticks

A bug in the function CHRestimate was fixed

Add CITATION file from JSS

Add reference to DTR-package.RD

Delete internal function stairstepn

Internal functions stat_stepribbon and StatStepribbon were revised for newest version of ggplot2