title: Guest editors' note: Special issue on subgroup analysis in clinical trials.
authors.affiliation: a US Food and Drug Administration , Silver Spring , Maryland , USA.
authors.forename: Sue-Jane
authors.initials: SJ
authors.lastname: Wang
authors.forename: Alex
authors.initials: A
authors.lastname: Dmitrienko
mesh_terms: D002986:Clinical Trials as Topic / Q000331:legislation & jurisprudence / Q000706:statistics & numerical data*; D003627:Data Interpretation, Statistical; D012107:Research Design / Q000331:legislation & jurisprudence / Q000706:statistics & numerical data*