Slide Kinh tế lượng: Lecture 9- Time Series
COMPONENTS OF A TIME SERIES
Time series: An ordered sequence of values of a variable at equally spaced time intervals
Such as: vn index, inflation, gdp growth rate, etc.
Components:
Trend
Seasonality
Cycle
Irregular
The 4 components may make up a TS in two ways:
additive model: Xt = Tt + St+Ct+It
multiplicative model: Xt = Tt * St *Ct*It