Sample cross-correlation

`crosscorr(`

plots
the sample
cross correlation (XCF) between the two univariate, stochastic
time series `y1`

,`y2`

)`y1`

and `y2`

with
confidence bounds.

[1] Box, G. E. P., G. M. Jenkins, and G. C. Reinsel. *Time
Series Analysis: Forecasting and Control*. 3rd ed. Englewood
Cliffs, NJ: Prentice Hall, 1994.

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