randomForest

To be more clear,

My data set contains two classes.. Class 1 and Class 2
Class 1 has original data with 300 rows
Class 2 is randomly generated data with 1500 rows.

I want to sample a new data set with
Class 1 - all the rows
Class 2 - only 300 rows out of 1500 rows

and then use it in random forest with 500 trees.

Also the Class 2 should have different 300 rows for different trees in the
forest. Thanks!

Anirudh Kondaveeti
----------------------------


On Fri, Mar 20, 2009 at 1:45 PM, Anirudh Kondaveeti <
anirudh.kondaveeti at gmail.com> wrote:

sampsize uses the same sample for all the trees in the random Forest.

But I want to use different sample for each tree of the 500 trees in the
random Forest. Thanks!


Anirudh Kondaveeti
----------------------------


2009/3/20 Uwe Ligges <ligges at statistik.tu-dortmund.de>

Anirudh Kondaveeti wrote:

Hi!

I am dealing with random forest using R.

Is there a way to sample a fixed no.of rows from a dataset for use with
different trees in random Forest.
To be more clear, my data set contains 1500 rows, and I am growing 500
trees
in Random Forest
Is it possible to sample only 500 rows of data from the data set and use
it
for different trees in the forest. I mean each tree of the forest should
use
a different 500 rows from the data set.

See ?randomForest and the argument sampsize.

Uwe Ligges

Thanks in advance!

Anirudh Kondaveeti
----------------------------

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