R help - Dec 2009 - bootstrap help

Hi,

I have 49 pairs in my data.frame 'data'

x	y
76	80
138	143
67	67
29	50
381	464
23	48
37	63
120	115

...  ...

how do I get a bootstrap sample of size n=50?

i have tried 
sample(data,size=50,replace=TRUE)
and
sample(data,replace=TRUE)

both didnt seem to work (the latter one only return me with 49 sample)

Thanks.

casper

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Hi?

I have a dataframe with x and y in pairs, ( 49 pairs i.e. 49 rows )

x y
76 80
138 143
67 67
29 50
381 464
23 48
37 63
120 115
....

how do i generate 50 Bootstrap samples and corresponding estimates?

i have tried

sample( data, size=50,replace=T)

does not seem to be right

Thanks.

casperyc <casperyc <at> hotmail.co.uk> writes:
> I have 49 pairs in my data.frame 'data'
> 
> x	y
> 76	80
> ...  ...
> 
> how do I get a bootstrap sample of size n=50?
> 
data[sample(nrow(data),size=50,replace=TRUE),]