To cite RRF in publications use:

Izmirlian G (2004). “Interim Analysis Planning using the PwrGSD package.” NCI Div. of Cancer Prevention.

Izmirlian G (2014). “Estimation of the relative risk following group sequential procedure based upon the weighted log-rank statistic.”

Statistics and its Interface,7(1), 27-42.

Corresponding BibTeX entries:

@TechReport{, title = {Interim Analysis Planning using the PwrGSD package}, author = {Grant Izmirlian}, institution = {NCI Div. of Cancer Prevention}, year = {2004}, }

@Article{, title = {Estimation of the relative risk following group sequential procedure based upon the weighted log-rank statistic}, author = {Grant Izmirlian}, journal = {Statistics and its Interface}, year = {2014}, volume = {7}, number = {1}, pages = {27-42}, }