Editing Time Series Analysis (section)

== <span style="color: #FFFFFF;">Analyzing</span> ==
{| class="wikitable"
|+ Additive vs. Multiplicative Seasonality
! Type !! Description !! Example
|-
| Additive || Seasonal variation is constant (±10 units) || Monthly gym attendance
|-
| Multiplicative || Seasonal variation grows with the trend (±10%) || Airline passengers (more people travel in summer as the total industry grows)
|}

**The Random Walk**: Some time series (like the stock market in the short term) are "Random Walks." This means the best prediction for tomorrow is simply "whatever it is today" plus some random noise. In a true random walk, technical analysis (looking at charts) is impossible—a hard lesson for many traders.
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