Analysis of Time series concept and problems

Cost of living Index numbers    • Cost of living index numbers   👆 Time series is a collection of observations made sequentially in time.- C.Chatfield Componentsof Time series: 1.Trend 2. Seasonal variations,3. Cyclical variations and 4.Irregular variations Methods of measuring Trend: 1.Graphic method 2. Semi Averages method 3. Method of Moving averages and 4. Method of least squares.