what is the first wiggle when using arima why do we have initial wiggle in the prediction r why does arima model have wiggles why does r forecast wiggle why does arima have initial wiggle? r wiggle when predicting what causes initial wiggle why wiggle in forecast how do you get initial wiggle of r what causes initial wiggle in r forecast irma wiggle why initial wiggle in arima why do you have initial wiggle in the model why arima prediction wiggle how to get a wiggle when modelling arima in r why do we have initial wiggle in the prediction of arima model r does arima predict why does arima model wiggle what causes initial wiggle what causes initial wiggle