[R] Z score

[Rui Barradas]

Hello,

Try the following.

apply(MyFile, 1, scale)

Hope this helps,

Rui Barradas
Em 24-10-2012 07:17, Vedant Sharma escreveu:
> Hi,
>
> I need to find the z-score of the data present in a speardsheet. The values
> needs to be calculated for each gene across the samples (refer the
> example). And, it should be a simple thing, but I am unable to do it right
> now !
>
> The example re the structure of the spreadsheet is  -
>
> # Example:
>
> MyFile <- read.csv( text=
> "Names,'Sample_1','Sample_2','Sample_3'
> Gene_1,87,77,88
> Gene_2,98,22,34
> Gene_3,33,43,33
> Gene_4,78,,81
> ", header=TRUE, row.names=1, as.is=TRUE, quote="'", na.strings="" )
>
> And, I think this formula that can be used for z score is -
>
> (x-mean(x))/sd(x)
>
> And, apply() function for rows should work. But bottomline - I am unable to
> do it correctly.
>
> Could you show me - using apply () or some other alternative function.
>
> Thank you.
>
> Cheers,
> Ved
>
> 	[[alternative HTML version deleted]]
>
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