[R-SIG-Finance] Grouping of stocks

[Ravi S. Shankar]

Hi R,

I am trying to find the number of stocks rising and number of stocks
falling each month. What I had in mind was I would compare the price of
each stock with the previous month's price and then group the stocks. Is
there a better way of doing this? An apology if this seems a very basic
question!
I have about 1500 stocks in my universe. 

Ravi

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