how are the acf and pacf calculated for an ma why is apcf truncated in ma when is pacf truncated which is true of PACF why is the acf truncated when does the pacf truncate which is a correct interpretation of the macf why is the acf truncated in an ar process? what is the function acf what is pacf in time series what is the definition of pacf? why is the acf truncate what is PACF and acf truncate why is the acf truncated what does pacf stand for in a time series? how does the autocorrelation function work what is the acf in ma why PACF truncates can you interpret apcf in a process why is pacf truncated