Re: Working on Data

[Tom Droege <tdroege2@earthlink.net>]

Andrew and all,

I think it depends on which data you are looking at.  If the data is from 
times where I was tracking a field, then removing "bad" images seems to get 
an improvement.  If the data is from a set where the camera is pointing at 
a (relatively) random spot in the sky, then I see little improvement from 
discarding data.

I have also thrown away more than half the data.

I am still working on it.

Tom Droege

At 12:28 AM 7/10/03 +0100, Andrew Bennett wrote:
>On 09 Jul 2003 14:13:51 -0400, Tom Droege <tdroege2@earthlink.net>
>wrote:
>
> >So far I have concluded:
> >
> >1) Some of the data is clearly bad.
> >2) One can identify and remove "bad" data.
> >3) The result is only a slight improvement when measured by a sigma vs
> >mag plot.
>
>This contradicts my conclusions in TN94, where I got
>quite large improvements if I threw away enough data -
>more than half the images.