Time Series Analysis Flashcards
1
Q
Trend
A
The underlying long-term movement over time, excluding the effects of seasonal variation.
- graphs
- linear regression
- moving averages
2
Q
Seasonal variation
A
Short term fluctuations that have been experienced historically.
- additive model
- multiplicative model
3
Q
Additive model
A
TS = T + S
- Time series given in absolute terms
- Assumes seasonal variations are independent of the trend
4
Q
Multiplicative model
A
TS = T * S
- Time series given as a % of fraction
- Assumes seasonal variations are linked to the size of the trend
5
Q
Cyclic variations
A
Longer-term fluctuations caused by factors such as economic activity or economic cycles
6
Q
Random variations
A
Unpredictable fluctuations, such as an act of nature
7
Q
Advantages of time series analysis
A
BAT
8
Q
Disadvantages of time series analysis
A
PASS
