الفهرس 
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Abstract
We review the basicde finitions and coreideas of times eriesanaly sisin this chapter Of specifics ignificanceare the ideas of stationarity and the auto covarian ceandauto correlation functions .Weadditionally talk about the essential ideas of awide class of parametric times eriesmodels,t heaut oregressivemov ingaverage(ARMA).These models have as sumed importance inmodellingreal-world processes.A time series is aset of obser vations fXtg taken sequentially over timet.A discrete timeseries, which is the type to which this the sisisded icated,is onein which the time thas discrete values(typically0, 1, 2, 3,. ..or0,1,2,3,...),as is thecase, forexample, when observation saremadeatregularinte rvals of time.Itis know nasacontinuous times eriesif not.Aninteger-valued times eriesis one where Xt is aninteger-value drandom variable foreacht.