ramia order which order should be chosen for acf which order is afc or pacf which order does aarima use in acf what is the order of a pyra what is a choice problem of (p,d,q) order for arima what order is in arima what is the lag order of arima? what is a choice for a armama model how to find the order of arima does acf show spike if spike is shown at lag 4 can i make the model as pdq which order is p,d,q arima graph shows spike at lag how to do a choice problem when does a spike occur in arima what is acf acf acf lags what is a decision problem of a (p,d,q) order what is the order for a r interval