If Ͳ൏߮൏ͳ the trend is damped, if ߮ൌͳ, the equations become identical to the Holt's Linear Trend method.
Tashman and Kruk [7] show that there may be value in allocating ߮ͳ, if applied in series with a strong
tendency, especially with exponential trend. However, Taylor [8] showed that if the process is exponential, then
a suitable method would be one that actually model such trend, as the method Standard Pegels. So Taylor
introduced a damping parameter to the Exponential Trend method resulting to a Multiplicative Damped Trend
method or Damped Pegels. The respective equations are shown below.