Cross-correlograms

It is possible to extend these principles to die comparison of two independent time series. Consider measuring die levels of Ag and Ni in a river witii time. Although each may show a cyclical trend, are tiiere trends common to botii metals The crosscorrelation function between x and y can be calculated for a lag of l  

---

Table 3.8 Figure 3.15 Two time series, for which the cross- correlogram is presented in...

Two time series (top) and their corresponding cross-correlogram (bottom)... 

Calculate the cross-correlogram of these time series, by lagging the second time series by between —20 and 20 points relative to the first time series. To perform... 

Plot a graph of the cross-correlogram. Are there any frequencies common to both time series ... 

Figure 9 Auto- and cross-correlogram profile obtained for the furoyl-piperidinyl-methyl-indol sketched in Fig. 8, using a hydrogen bond donor (Nl) and hydrogen bond acceptor (O) probe. The 0-0 autocorrelogram is on the left, the Nl-Nl autocorrelogram in the middle, and the Nl-O cross-correlogram on the right.

FIGURE 32.15 Cross correlograms of single action potentials. 

It is also possible to compare two different time series, a similar procedure is used to compute a cross-correlogram where each time series is lagged against one another. This correlogram is no longer symmetric. It may be useful if, for example, we record a... 

---