> ...if I had the closing prices of the
> S&P from 01/01/1990-12/31/1990, how could I get the average price of
> the S&P from 02/01/1990-03/15/1990? Or the average price of the S&P on
> Mondays (assuming a dummy var is created for 1 = Monday, 0 = else).
tapply has already been referred to. You m
ings very differently at times.
John Kane
Kingston ON Canada
> -Original Message-
> From: thoms...@email.arizona.edu
> Sent: Mon, 7 Jan 2013 19:17:27 -0600
> To: r-help@r-project.org
> Subject: [R] Conditional Statistics
>
> Hello,
>
> I am a new user of R. I
You can use the tapply function to do this. You can't type a line into
the mean statement. (See ?mean for what you can type in there). The
general approach is to have a vector of data (stock prices) and a
categorical variable (day of week). Then break up the data vector
according to the levels
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
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