addtc                   Determines TC intervals and breaks up dataset
                        into TC intervals
cox                     Calls coxfitter() function
coxfitter               Fits Cox model using coxph() function
example.dat             Simulated data from Observational Study
htc                     Prepares and fits an HTC Cox model
htcfitter               Fits HTC Cox model using coxph() function
itc                     Prepares and fits an ITC Cox model
itcadd                  Determines potential ITC intervals according to
                        expected event criteria or as fixed
itcfitter               Fits ITC Cox model using coxph() function
ptc                     Prepares and fits a PTC Cox model
ptcfitter               Fits PTC Cox model using coxph() function
tc                      Treatment Choice Cox Model
treatinit               Gets dataset into standard form
