Root Mean Square Error (Skill Score)

Root Mean Square Error: RMSE(y_pred, y_true)
library(MLmetrics) RMSE_RO = RMSE(RTemp$RTmax, OTemp1$OTmax) RMSE_Tmax1 = RMSE(Val_Temp1$Tmax, OTemp1$OTmax)
 * 1) Reference-Value and Original-Value
 * 1) Root Mean Square Error: Modell-Valueund Original-Value

Root Mean Square Error Skill Score: 1-(RMSE Modelle/RMSE_daily climatiology)
HGT500_Tmax1 = 1- (RMSErrors[1,2]/ RMSErrors[5,2])