Frequency
No threshold breach of the model (14)
16 correct forecasts
18 Type 1 errors
Lag
Conc.
Situation a) Linear trend, linear extrapolation with small error, harmonic extrapolation problematic.
Situation b) Concave trend, linear extrapolation with large error, harmonic extrapolation with small error.
Situation c) Convex trend, linear extrapolation with large error, harmonic extrapolation with small error.
Situation d) Trend veers off, linear extrapolation with large error, harmonic extrapolation with large error.