Copy Tree with weights (bootstrap)

ROOT
1

Hello,

I would like to make several copies of an ntuple, where I give each event a weight according to a Poissonian distribution (with mean = 1), basically these are samples for a bootstrap analysis.
I was thinking of using CloneTree (ROOT: tutorials/tree/copytree3.C File Reference) but it looks like I have to loop over all entries (the key statement here is Fill()).
Is there any other more efficient way?

Many thanks in advance!

D.

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ROOT Version: 6.20/04
Platform: Ubuntu 20.04.3 LTS, Release: 20.04
Compiler: Not Provided

2

Maybe @pcanal knows better, but AFAIK you effectively have to loop over the entries

3

If you need just need ‘integer’ weight, then calling Fill multiple time is the simplest. If you need fractional weight, then you might be better off adding a new column (for example in a friend TTree) with the value of the weight.

4

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