smith bain lifetime distributionsmoothsmoothingsmoothnesssmoothness priorsnedecor distributionsnowballsnowball samplingsnowflakesobolev spacesocial network analysissocial security statisticssocial statisticssociologysociometrysoft modelingsoftware reliabilitysojourn timesolutionsolution matrixsor methodspacespacingspan testsparse matricesspatial data analysisspatial distributionspatial medianspatial processspatial samplingspcspearman brown formulaspearman estimatorspearman rank correlation coefficientspeciesspecific factorsspecific variancespecificationspecificityspecificity sensitivityspectralspectral analysisspectral decompositionspectral density functionspectral distributionspectral estimationspectral factorizationspectral functionspectral windowsphere