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weekmeans
2013 Jan 08
3
Conditional Statistics
Hello,
I am a new user of R. I am coming from SAS and do statistics on stock
market data, economic data, and social data. My question is this: How
can you get the mean, standard dev, etc. of a variable based on a
conditional statement on either the same variable or a different
variable in the same data set? So if I had the closing prices of the
S&P from 01/01/1990-12/31/1990, how could I get