[gradsusr] Lead-lag Correlation

[SBR]

Dear User,I have monthly mean Nino3.4 Index and Global precipitation for the period Jan1979 to Dec2012.I would like to calculate the lead/lag correlation between Nino3.4 index and precipitation.Could you please tell me the way to do it.I am trying to use the script "tlag.gs"given by Bin Guan in the below webpage.http://www.atmos.umd.edu/~bguan/grads/GrADS_Scripts.html
However, I don't what should be the syntax to get the lead/lag correlation.
Thanks.SB
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