what is arima function how to use arima when is arima function available arima function how to use model in r can you fit data on a dataframe in r how to specify training sets in r what is the arima variable? where is r function data r what is an arima function which method is used to specify a subset of a model? which method to use to specify a subset in r? where is arima used when specify the training set in r, arima function is not available? what is arima function what is the arima function in r arima function not available what is the data in arima what is arima data how to specify training set in r javascript