## Question:

How can I use NumXL to compute the correlation matrix for 2-time series with lags?

## Answer:

Using the cross-correlation (XCF(.)) and the Backshift/Lag (LAG(.)) functions, you can compute the correlation factors for any lag orders.

**Example:** Let's assume we have two-time series; Series A and Series B

Series A is stored in cells B1:B200

Series B is stored in cells C1:C200

To compute the cross-correlation matrix (R), we use the XCF(.), and LAG(.) functions as follow:**R(j,k) = XCF(LAG(B1:B200,1,j),1, LAG(C1:C200,1,k),1)**

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