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I am trying to learn Holt Winters exponential smoothing. In the algorithm there are three indices involved (level, trend, seasonality) while forecasting.

My questions:

What is the interpretation of these 3 indices?
How do I differentiate between different values of these indices? For example, what is the difference between level 100 and level 200 or what is the difference between trend 2 and trend 5?
How do we initiate these values?

Any help will be greatly appreciated.

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