rotatablerotatable designrotating panelrotation anglerotation grouprotation group biasrotation samplingrotation techniqueroughroughnessroughness penaltyround off errorround robin tournamentsrounded distributionrounding rulerouteroute samplingrow and column designrow operationrulerule of sumrule spacerunrun lengthrunning medianruns testruns test for symmetryruns up and down testssaddle pointsaddle point approximationsafequardsafetysafety campaignsaint petersburg paradoxsalem singular distributionsampford samplingsamplesample autocorrelationsample autocovariancesample correlation coefficientsample covariancesample designsample functionsample meansample mediansample numbersample pathsample pointsample reuse