what is the annual seasonality of the arima model what model uses multiplier r to predict holidays how do you forecast holiday effects in arima does arima use seasonality? how to model weekly rmse r how to model seasonality what is the difference between arima and tbes average accuracy arima how to forecast in arima weekly how accurate is arima what is the average rmse of arima how accurate is tbismama when using arima time series average seasonality for r model tbats weekly forecast accuracy what is tbats model average weekly accuracy for arima what is arima and regressor arima vs tbats what is tbas in time series