return periodreturn statereversalreversal designreversal testreverse martingalereverse processrevesz estimator of regression functionreweightedrice distributionrichards family of growth curvesrichness of speciesridge regressionridit analysisriedwyl one sample testriemann stieltjes integralriesz fischer theoremright censoredright censoringright haar measurering width indexriordan identityriskrisk analysisrisk functionrisk theoryritz methodrobbins monro procedurerobustrobust distancerobust estimationrobust inspection sampling planrobust regressionrobust resistant linerobust smoothingrobust substituterobust testrobust test for change point modelrobustificationrobustnessrobustness in experimental designromanovskii r testroot mean squareroot mean square deviationroot testrootagonrootistic distributionrootogramrose diagramrotatability index