How I remove data with low Statistics in ntuple

ROOT
1

Hi everyone
I have a ntuple which has many data: low to high Statistics, but I need data with high Statistics.
How I can choose them? Is there any direct order?

thanks

2

that’s not something you can express with the selector parameter of the Draw method ?

3

hmmm, I don’t want to draw…I want to choose some data with high statistics, because I have to do some calculates on them.

4

I said Draw() but it can be Scan() or Draw() with “goff”…

What to you mean by “choose”… ? fill a histogram ?

5

[quote=“couet”]I said Draw() but it can be Scan() or Draw() with “goff”…

What to you mean by “choose”… ? fill a histogram ?[/quote]

suppose you want to plus data with high statistics…how you do this?

6

I am sorry, but I do not understand what you mean by “to plus data”…
Do you have some concrete example ?

7

[quote=“couet”]I am sorry, but I do not understand what you mean by “to plus data”…
Do you have some concrete example ?[/quote]

don’t worry…I’m sorry for my bad English, I mean “to add” , “to sum”,…

yeah, I want to do this:

but I should get error on data with high statistics in ntuple.

8

Ok I understand. The Draw command should allow you do do that.

ntuple->Draw("V1 > h1", "some_selection", "goff");

after that you have in the histogram h1 the variable V1