[R] mean and sd for a Dataframe

[David Winsemius]

On Feb 10, 2011, at 12:24 AM, Ramya wrote:

>
> hi there,
> I need to subtract each value in the dataframe from the mean of the  
> column
> and divide by the
> standard deviation of the column.
>
>
>> dim(a)
> [1] 22011    52
>
> data2 <- sapply(seq(from = 2, by = 1, length = 50), function(e){
> rbind((a[[e]] - mean(a[,e]))/sd(a[,e]))
> })
>
> Does this look right????

It looks like the "hard way" ( and it's not clear why one would need  
rbind, either):

?scale

scale(a)


>
> Any help would be appreciated.
>
> Thanks
> RT
>
>
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David Winsemius, MD
West Hartford, CT