GOOG

plot_pacf(goog['LogRet'].dropna());

plot_acf(goog['LogRet'].dropna())

AAPL

plot_pacf(aapl['LogRet'].dropna())

plot_acf(aapl['LogRet'].dropna())

IBM

plot_pacf(ibm['LogRet'].dropna()

plot_acf(ibm['LogRet'].dropna())

SBUX

plot_pacf(sbux['LogRet'].dropna())

plot_acf(sbux['LogRet'].dropna())