peacf               calculate and plot periodic autocorrelation
peacf.plot	    plot periodic corrrelation function
pear		    fit periodic autoregression model
peboxplot           boxplot of periodic time series
pepacf		    calculate and plot periodic partial autocorrelation
peplot		    visualization plots for periodic correlations
pepsi		    moving average expansion for periodic autoregression
fraser              mean monthly flow of Fraser River at Hope, B.C.
ozone		    ozone concentration in L.A.
