[R] bootstrap help

[casperyc]

Hi there,

i think that's not what i was aiming for...

i was aked to 

Generate 50 Bootstrap samples and corresponding estimates

if i do data[sample(nrow(data),size=50,replace=TRUE),]
it will give me a table of 50 rows ( 50 sets of x and y)
then how do i estimate the mean? ( mean was esitmated by the bar{x}/bar{y} )

i mis undertood that too.
but now, i think what i actually need is

50 sets of this kind (49 rows) of tables from bootstrapping
so that i can have 50 different 'bar{x}/bar{y}' s
then to estimate the mean...

Thanks.

casper



Ben Bolker wrote:
> 
> 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),]
> 
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