Changes

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permno-
 
date-
 
excode -
 
sic - letter "Z", value 711 (most are 4 digits),
 
ncusip -
 
ticker -
 
name -
 
naics -
 
primex -
 
permco -
 
cusip -
 
Price - Null values, negative numbers,
 
vol - null values
 
ret - null values, letter "B" as value multiple times, letter "C",
 
shout - null values
 
trade - null values
 
eqret -
 
vret -
668

edits

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