Hi,
May be this helps:
small <- read.table(text="monthend_n ticker wgtdiff ret interval b1 b2 b3 b4 b5
b6
1 19990228 AA 0.7172 -2.58 0.33896 -0.5868 -0.24784 0.09112 0.43008 0.76904
1.108
2 19990228 AAPL -0.0828 -15.48 0.33896 -0.5868 -0.24784 0.09112 0.43008 0.76904
1.108
3 19990228 ABCW 0.0
I have a dataframe "small" whch has 5,000 rows and contains data for several
tickers every month, as below:
monthend_n ticker wgtdiff ret interval b1 b2 b3 b4 b5 b6
1 19990228 AA 0.7172 -2.58 0.33896 -0.5868 -0.24784 0.09112 0.43008 0.76904
1.108
2 19990228 AAPL -0.0828 -15.48 0.33896 -0.
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