phreg initial commit of working code
Added summary; other fixes; ready for PR
Removed unneeded import that was breaking on travis
Renamed R output files to .txt
Moved test script to tests directoy
Remove deleted files
Moved test generator to tests directory
Remove copy of test script
FIxed import path
Fix typo in test script
Fixed naming and added CI bands to plotting for Kaplan-Meier, added class for Cox Proportional Hazard models, and create classes for inputs and results for both models
For Cox models, allowed inherited fit options, seperated tests, and allowed exp of coeffs for con_int
Fixed and test hypothesis tests and confidence intervals for Cox models
Added efron approximation for tied times to Cox models
Added fitting with stratification to Kaplan-Meier
Added stratification to Cox models, and fixed group selection for Kaplan-Meier models with more that 1 category of covariates
Tested loglike for stratified Cox models
Tested score and hessian for stratified Cox models
Tested test_diff method for Kaplan-Meier models with more than 1 covariate
Added handling for time-dependent covariates for Cox models