sphere packingspherical distributionspherical medianspherical regressionsphericityspike trainsspitzer rosen theoremspline functionsplit plot designspontaneous processspreadsprtspssspuriousspurious associationspurious correlationspurious dependencesquaresquare matrixsquare rootsqueeze significance testssessrsststability groupstabilizationstabilizerstable distributionstable estimationstable homeomorphism conjecturestable populationstable processstagewise regressionstaircase methodstakestalactite plotstandard complexstandard deviationstandard errorstandard formstandard form of an equationstandard normal distributionstandardizationstandardized deviatestandardized distributionstandardized mortality ratiostandardized random variablestandardized ratestandardized residualstandardized test statistic