Table 5 Parameter value combinations that minimize root mean square error (RMSE) after reparametrizing the predictive discrete-dynamic model to simulate bud cold hardiness for five cold climate interspecific hybrid grapevine cultivars. Cold hardiness (H_{c}) predictions begin at H_{c, initial}, which is the earliest median low temperature exotherm (LT_{50}) observed. Predictions are bound by lower (H_{c, max}) and upper (H_{c, min}) limits. H_{c, max} is the lowest LT_{50} observed, while H_{c, min} is highest LT_{50} observed. Other parameters include endodormant temperature threshold (T_{th,endo}), ecodormant temperature threshold (T_{th,eco}), endodormant acclimation rate (k_{a,endo}), ecodormant acclimation rate (k_{a,eco}), endodormant deacclimation rate (k_{d,endo}), ecodormant deacclimation rate (k_{d,eco}), theta exponent in deacclimation logistic equation (θ), and ecodormancy boundary (EDB).