Python statsmodels autocovariance, autocorrelation and partial autocorrelation

ts_cov_corr.py

# Remember that there are slightly different formulas for weakly stationary and strictly stationary time series
from statsmodels.tsa.stattools import acovf,acf,pacf,pacf_yw,pacf_ols
from statsmodels.graphics.tsaplots import plot_acf,plot_pacf

# Lag plots
from pandas.plotting import lag_plot
lag_plot(df1['Thousands of Passengers']);