R yog 'GNU S', ib hom lus pub dawb thiab ib puag ncig rau kev txheeb cais xam thiab cov duab kos duab uas muab ntau yam ntawm kev txheeb cais thiab cov duab kos duab: linear thiab nonlinear modelling, statistical tests, lub sij hawm series tsom xam, kev faib tawm, clustering, thiab lwm yam