Quantitative: extrapolating from past sales
Time series analysis: months, quarters and years
Trend: showing linear movement over time (5%/yr)
Cyclical pattern: regular increases and decreases over time (typically 3-5 years)
Seasonal pattern: consistent increase and decrease within a year
Important: assumption is that the patterns of the part will continue in the future
This is where the industry analysis comes into play
Are there disruptive factors on the horizon?
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