Table 1: Classification and summary of ETS models.

Trend componentSeasonal component
N (none)A (additive)M (multiplicative)

N (none)N, NN, AN, M
A (additive)A, NA, AA, M
Ad (additive damped)Ad, NAd, AAd, M
M (multiplicative)M, NM, AM, M
Md (multiplicative damped)Md, NMd, AMd, M