In [[statistics]], the term '''linear model''' isrefers usedto inany differentmodel wayswhich accordingassumes to[[linearity]] in the contextsystem. The most common occurrence is in connection with regression models and the term is often taken as synonymous with [[linear regression]] model. However, the term is also used in [[time series analysis]] with a different meaning. In each case, the designation "linear" is used to identify a subclass of models for which substantial reduction in the complexity of the related [[statistical theory]] is possible.
