ethz.ch
> *Sent:* Thursday, May 10, 2007 4:47 PM
> *Subject:* Re: [R] how to control the sampling to make each sample unique
>
>
> Yeah, I want to get all unique combinations of choosing ntest from ntotal.
>
> for example, choosing 4000 training data from 10,000 total data.
>
&
Yeah, I want to get all unique combinations of choosing ntest from ntotal.
for example, choosing 4000 training data from 10,000 total data.
Suppose they are sequenced as 1:10,000
One obvious combination is 1:4000
Then I run
sample ((1:1000), 4000)
it may output 4000 numbers:
1, 3, 5, 79
I think you're asking a design question about a Monte Carlo simulation. You
have a "population" (size 10,000) from which you're defining an empirical
distribution, and you're sampling from this to create pairs of training and
test samples.
You need to ensure that each specific pair of training an
Urania Sun wrote:
>
> I have a dataset of 1 records which I want to use to compare two
> prediction models.
>
> I split the records into test dataset (size = ntest) and training dataset
> (size = ntrain). Then I run the two models.
>
> Now I want to shuffle the data and rerun the models. I
I have a dataset of 1 records which I want to use to compare two
prediction models.
I split the records into test dataset (size = ntest) and training dataset
(size = ntrain). Then I run the two models.
Now I want to shuffle the data and rerun the models. I want many shuffles.
I know that the
