when examining time series, cross correlation is used to is cross correlation stationary why not use cross correlation in a time series why is cross correlation used in a time series why does the cross-correlation work with non stationary data how do you find cross correlation between two time series why cross correlation between time series why is cross correlation not true between x and y when using cross correlation to find a nonstationary relationship why is cross correlation used for non stationary data what is cross correlation what kind of correlation is a time series can you use the interpolation coefficients as x and y what is cross correlation of non stationary data cross correlation analysis non stationary data why would cross correlation be used does cross correlation always reflect correlation can the data be used by non stationary correlations if x or y contains autocorrelation what is cross correlation