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Another approach is to break up the file as follows:
OldData 1/1/80-12/31/99 and forward adjust it.
NewDate 9/1/99(gives you 4 months of prime data) - Present. This should
back adjust without negative numbers. However if you try starting a year
earlier (9/1/98) you get negative numbers. So you could test on the old
data and trade on the new data.
Good Luck,
Robin
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