On 3 July 2012 22:03, Akhil dua <akhil.dua.12@gmail.com> wrote:

> and I need to run a seperate regression of every stock on market
> so I want to write a  "for loop"  so that I wont have to write codes again
> and again to run the regression...
>

1. Do give a subject line -- a blank one is commonly used by a virus.
2. In R/S+/most functional languages, you do not want to write a "for
loop". Use apply (and friends) instead.

> my data is in the format given below
>
> Date               Stock1  Stock2   Stock3    Market
> 01/01/2000         1           2          3             4
> 01/02/2000         5           6          7             8
> 01/03/2000         1           2          3             4
> 01/04/2000         5           6          7             8
>

For example, if you wanted to know the stocks share of the total market as
a fraction, you'd use something like:
sapply(myData[,c(2:4)], function(x) {
return(as.numeric(x)/as.numeric(myData[,4])) })

Hope that helps.. -- H
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